[Bug libstdc++/59048] std::string operator== between std::string and const char* creates unecessary temporary object

[luca.stoppa at bbh dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59048

--- Comment #3 from Luca Stoppa <luca.stoppa at bbh dot com> ---
Created attachment 31181
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31181&action=edit
testcase

g++ -O3 mapping.cpp

time ./a.out 10000000 f
time ./a.out 10000000 g
time ./a.out 10000000 h
time ./a.out 10000000 i

will execute the 4 different paths in the code.