/in/foo.cc:11:32: warning: overflow in implicit constant conversion [-Woverflow]
 const long long inf = pow(2,63)-1;
                       ~~~~~~~~~^~
/in/foo.cc: In function 'void read(T&)':
/in/foo.cc:28:5: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
     while (ch=getchar(),ch<48 || 57<ch) fl^=!(ch^45); x=(ch&15);
     ^~~~~
/in/foo.cc:28:55: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
     while (ch=getchar(),ch<48 || 57<ch) fl^=!(ch^45); x=(ch&15);
                                                       ^