c++11 - cygwin g++ std::stoi "error: ‘stoi’ is not a member of ‘std

Question

I have:

-cygwin 1.7.25 on windows 7/32bit

-g++ --version --> g++ (GCC) 4.8.2

-libstdc++.a --> gcc-g++-4.8.2-1

Tried to make a c++ Hello World:

#include <string>

int main() 
{
   std::string s = "123";
   int i = std::stoi(s);
}

compiling gives:

$ g++ -std=c++11 main.cpp
main.cpp: In function ‘int main()’:
main.cpp:6:10: error: ‘stoi’ is not a member of ‘std’
  int i = std::stoi(s);

I searched for hours but I still could not find a solution. What's the issue here?

Answer 1

That's a bug, possibly an incomplete port of some library code to cygwin (it's a cplusplus11 feature) - some stuff has to be changed after all. Make sure to report it.

The solution is easy of course: #include <cstdlib> strtol(s.c_str(),0,10);

www.cplusplus.com/.../strtol

A similar mingw bug is mentioned also here

std::stoi doesn't exist in g++ 4.6.1 on MinGW