foo.cc: In function 'int main()':
foo.cc:6:12: error: no match for 'operator<<' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int')
6 | cin<<a;
| ~~~^~~
| | |
| | int
| std::istream {aka std::basic_istream<char>}
foo.cc:6:12: note: candidate: 'operator<<(int, int)' <built-in>
6 | cin<<a;
| ~~~^~~
foo.cc:6:12: note: no known conversion for argument 1 from 'std::istream' {aka 'std::basic_istream<char>'} to 'int'
In file included from /usr/include/c++/9/regex:62,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:110,
from foo.cc:1:
/usr/include/c++/9/bits/regex.h:1553:5: note: candidate: 'template<class _Ch_type, class _Ch_traits, class _Bi_iter> std::basic_ostream<_CharT, _Traits>& std::__cxx11::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::sub_match<_Bi_iter>&)'
1553 | operator<<(basic_ostream<_Ch_type, _Ch_traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/regex.h:1553:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/string:55,
from /usr/include/c++/9/bits/locale_classes.h:40,
from /usr/include/c++/9/bits/ios_base.h:41,
from /usr/include/c++/9/ios:42,
from /usr/include/c++/9/istream:38,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/bits/basic_string.h:6416:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)'
6416 | operator<<(basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/basic_string.h:6416:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/bits/ios_base.h:46,
from /usr/include/c++/9/ios:42,
from /usr/include/c++/9/istream:38,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/system_error:217:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)'
217 | operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
| ^~~~~~~~
/usr/include/c++/9/system_error:217:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:506:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)'
506 | operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
| ^~~~~~~~
/usr/include/c++/9/ostream:506:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:511:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)'
511 | operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
| ^~~~~~~~
/usr/include/c++/9/ostream:511:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:517:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)'
517 | operator<<(basic_ostream<char, _Traits>& __out, char __c)
| ^~~~~~~~
/usr/include/c++/9/ostream:517:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:523:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)'
523 | operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
| ^~~~~~~~
/usr/include/c++/9/ostream:523:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:528:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)'
528 | operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
| ^~~~~~~~
/usr/include/c++/9/ostream:528:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:548:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)'
548 | operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
| ^~~~~~~~
/usr/include/c++/9/ostream:548:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/ostream:702,
from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/bits/ostream.tcc:321:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)'
321 | operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
| ^~~~~~~~
/usr/include/c++/9/bits/ostream.tcc:321:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:565:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)'
565 | operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
| ^~~~~~~~
/usr/include/c++/9/ostream:565:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:578:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)'
578 | operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
| ^~~~~~~~
/usr/include/c++/9/ostream:578:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:583:5: note: candidate: 'template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)'
583 | operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
| ^~~~~~~~
/usr/include/c++/9/ostream:583:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<char, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/istream:39,
from /usr/include/c++/9/sstream:38,
from /usr/include/c++/9/complex:45,
from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/ostream:691:5: note: candidate: 'template<class _Ostream, class _Tp> typename std::enable_if<std::__and_<std::__not_<std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basic_ostream<_Ostream>, std::__is_insertable<typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type, const _Tp&, void> >::value, typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type>::type std::operator<<(_Ostream&&, const _Tp&)'
691 | operator<<(_Ostream&& __os, const _Tp& __x)
| ^~~~~~~~
/usr/include/c++/9/ostream:691:5: note: template argument deduction/substitution failed:
/usr/include/c++/9/ostream: In substitution of 'template<class _Ostream, class _Tp> typename std::enable_if<std::__and_<std::__not_<std::is_lvalue_reference<_Tp> >, std::__is_convertible_to_basic_ostream<_Ostream>, std::__is_insertable<typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type, const _Tp&, void> >::value, typename std::__is_convertible_to_basic_ostream<_Tp>::__ostream_type>::type std::operator<<(_Ostream&&, const _Tp&) [with _Ostream = std::basic_istream<char>&; _Tp = int]':
foo.cc:6:14: required from here
/usr/include/c++/9/ostream:691:5: error: no type named 'type' in 'struct std::enable_if<false, void>'
In file included from /usr/include/c++/9/ccomplex:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:54,
from foo.cc:1:
/usr/include/c++/9/complex:552:5: note: candidate: 'template<class _Tp, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::complex<_Tp>&)'
552 | operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x)
| ^~~~~~~~
/usr/include/c++/9/complex:552:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:66,
from foo.cc:1:
/usr/include/c++/9/bitset:1538:5: note: candidate: 'template<class _CharT, class _Traits, long unsigned int _Nb> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::bitset<_Nb>&)'
1538 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bitset:1538:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
from foo.cc:1:
/usr/include/c++/9/iomanip:79:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Resetiosflags)'
79 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Resetiosflags __f)
| ^~~~~~~~
/usr/include/c++/9/iomanip:79:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
from foo.cc:1:
/usr/include/c++/9/iomanip:109:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setiosflags)'
109 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setiosflags __f)
| ^~~~~~~~
/usr/include/c++/9/iomanip:109:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
from foo.cc:1:
/usr/include/c++/9/iomanip:143:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setbase)'
143 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setbase __f)
| ^~~~~~~~
/usr/include/c++/9/iomanip:143:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
from foo.cc:1:
/usr/include/c++/9/iomanip:178:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setfill<_CharT>)'
178 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setfill<_CharT> __f)
| ^~~~~~~~
/usr/include/c++/9/iomanip:178:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
from foo.cc:1:
/usr/include/c++/9/iomanip:208:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setprecision)'
208 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setprecision __f)
| ^~~~~~~~
/usr/include/c++/9/iomanip:208:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
from foo.cc:1:
/usr/include/c++/9/iomanip:238:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Setw)'
238 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Setw __f)
| ^~~~~~~~
/usr/include/c++/9/iomanip:238:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
from foo.cc:1:
/usr/include/c++/9/iomanip:311:5: note: candidate: 'template<class _CharT, class _Traits, class _MoneyT> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Put_money<_MoneyT>)'
311 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_money<_MoneyT> __f)
| ^~~~~~~~
/usr/include/c++/9/iomanip:311:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:72,
from foo.cc:1:
/usr/include/c++/9/iomanip:363:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::_Put_time<_CharT>)'
363 | operator<<(basic_ostream<_CharT, _Traits>& __os, _Put_time<_CharT> __f)
| ^~~~~~~~
/usr/include/c++/9/iomanip:363:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/memory:81,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:82,
from foo.cc:1:
/usr/include/c++/9/bits/shared_ptr.h:66:5: note: candidate: 'template<class _Ch, class _Tr, class _Tp, __gnu_cxx::_Lock_policy _Lp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__shared_ptr<_Tp, _Lp>&)'
66 | operator<<(std::basic_ostream<_Ch, _Tr>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/shared_ptr.h:66:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/valarray:603,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:413:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::_Expr<_Dom2, typename _Dom2::value_type>&)'
413 | _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:413:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/valarray:603,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:413:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
413 | _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:413:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/valarray:603,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:413:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const typename _Dom::value_type&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)'
413 | _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:413:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/valarray:603,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:413:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const std::_Expr<_Dom1, typename _Dom1::value_type>&, const std::valarray<typename _Dom::value_type>&)'
413 | _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:413:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/valarray:603,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
from foo.cc:1:
/usr/include/c++/9/bits/valarray_after.h:413:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__shift_left, typename _Dom1::value_type>::result_type> std::operator<<(const std::valarray<typename _Dom::value_type>&, const std::_Expr<_Dom1, typename _Dom1::value_type>&)'
413 | _DEFINE_EXPR_BINARY_OPERATOR(<<, __shift_left)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/bits/valarray_after.h:413:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
from foo.cc:1:
/usr/include/c++/9/valarray:1193:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__shift_left, _Tp>::result_type> std::operator<<(const std::valarray<_Tp>&, const std::valarray<_Tp>&)'
1193 | _DEFINE_BINARY_OPERATOR(<<, __shift_left)
| ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/valarray:1193:1: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::valarray<_Tp>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
from foo.cc:1:
/usr/include/c++/9/valarray:1193:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__shift_left, _Tp>::result_type> std::operator<<(const std::valarray<_Tp>&, const typename std::valarray<_Tp>::value_type&)'
1193 | _DEFINE_BINARY_OPERATOR(<<, __shift_left)
| ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/valarray:1193:1: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'const std::valarray<_Tp>'
6 | cin<<a;
| ^
In file included from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:95,
from foo.cc:1:
/usr/include/c++/9/valarray:1193:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__shift_left, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__shift_left, _Tp>::result_type> std::operator<<(const typename std::valarray<_Tp>::value_type&, const std::valarray<_Tp>&)'
1193 | _DEFINE_BINARY_OPERATOR(<<, __shift_left)
| ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/9/valarray:1193:1: note: template argument deduction/substitution failed:
foo.cc:6:14: note: mismatched types 'const std::valarray<_Tp>' and 'int'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/future:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:105,
from foo.cc:1:
/usr/include/c++/9/thread:322:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, std::thread::id)'
322 | operator<<(basic_ostream<_CharT, _Traits>& __out, thread::id __id)
| ^~~~~~~~
/usr/include/c++/9/thread:322:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:49,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.h:1298:5: note: candidate: 'template<class _RandomNumberEngine, long unsigned int __w, class _UIntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::independent_bits_engine<_RandomNumberEngine, __w, _UIntType>&)'
1298 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.h:1298:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:877:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::uniform_int_distribution<_IntType>&)'
877 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:877:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:936:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::uniform_real_distribution<_IntType>&)'
936 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:936:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2133:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::cauchy_distribution<_RealType>&)'
2133 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2133:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:998:5: note: candidate: 'template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::bernoulli_distribution&)'
998 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:998:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1080:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::geometric_distribution<_IntType>&)'
1080 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1080:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1737:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::exponential_distribution<_RealType>&)'
1737 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1737:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2532:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::weibull_distribution<_RealType>&)'
2532 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2532:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2608:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::extreme_value_distribution<_RealType>&)'
2608 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2608:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:154:5: note: candidate: 'template<class _UIntType, _UIntType __a, _UIntType __c, _UIntType __m, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::linear_congruential_engine<_UIntType, __a, __c, __m>&)'
154 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:154:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:476:5: note: candidate: 'template<class _UIntType1, long unsigned int __w1, long unsigned int __n1, long unsigned int __m1, long unsigned int __r1, _UIntType1 __a1, long unsigned int __u1, _UIntType1 __d1, long unsigned int __s1, _UIntType1 __b1, long unsigned int __t1, _UIntType1 __c1, long unsigned int __l1, _UIntType1 __f1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::mersenne_twister_engine<_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f>&)'
476 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:476:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:632:5: note: candidate: 'template<class _UIntType, long unsigned int __w, long unsigned int __s, long unsigned int __r, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::subtract_with_carry_engine<_UIntType, __w, __s, __r>&)'
632 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:632:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:702:5: note: candidate: 'template<class _RandomNumberEngine, long unsigned int __p, long unsigned int __r, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::discard_block_engine<_RandomNumberEngine, __p, __r>&)'
702 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:702:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:831:5: note: candidate: 'template<class _RandomNumberEngine, long unsigned int __k, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::shuffle_order_engine<_RandomNumberEngine, __k>&)'
831 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:831:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1195:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::negative_binomial_distribution<_IntType>&)'
1195 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1195:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1406:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::poisson_distribution<_IntType>&)'
1406 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1406:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1673:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::binomial_distribution<_IntType>&)'
1673 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1673:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1904:5: note: candidate: 'template<class _RealType1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::normal_distribution<_RealType>&)'
1904 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1904:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:1973:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::lognormal_distribution<_RealType>&)'
1973 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:1973:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2046:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::chi_squared_distribution<_RealType>&)'
2046 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2046:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2210:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::fisher_f_distribution<_RealType>&)'
2210 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2210:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2285:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::student_t_distribution<_RealType>&)'
2285 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2285:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2454:5: note: candidate: 'template<class _RealType1, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::gamma_distribution<_RealType>&)'
2454 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2454:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2744:5: note: candidate: 'template<class _IntType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::discrete_distribution<_IntType>&)'
2744 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2744:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:2967:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::piecewise_constant_distribution<_RealType>&)'
2967 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:2967:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
In file included from /usr/include/c++/9/random:51,
from /usr/include/x86_64-linux-gnu/c++/9/bits/stdc++.h:108,
from foo.cc:1:
/usr/include/c++/9/bits/random.tcc:3174:5: note: candidate: 'template<class _RealType, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::piecewise_linear_distribution<_RealType>&)'
3174 | operator<<(std::basic_ostream<_CharT, _Traits>& __os,
| ^~~~~~~~
/usr/include/c++/9/bits/random.tcc:3174:5: note: template argument deduction/substitution failed:
foo.cc:6:14: note: 'std::istream' {aka 'std::basic_istream<char>'} is not derived from 'std::basic_ostream<_CharT, _Traits>'
6 | cin<<a;
| ^
2020223金诗涵 (2020123金诗涵) LV 6
undefined
