C++11 typedef alias compile error

Question

When I try to compile this, I get the following error:

error: expected unqualified-id before ‘using’

I know, this was asked several times before, but I didn't find the answer. Usually they say that a semicolon is missing in one of the header files. But it's not the case now. And of course I use the -std=c++0x flag

#include <iostream>
#include <string>
#include <vector>


template <typename T>
using stringpair = std::pair<std::string, T>;

int main (int argc, char* argv[]) {


    return 0;
}

Answer 1

Your error is caused by the fact that template aliases with using is a C++11 feature and your compiler does not support it. You should add the corresponding flags at compilation. Those most likely are:

-std=c++11

(at least for g++ and clang++ ).

Live demo

Otherwise your compiler does not support them yet. GCC supports them from 4.7 .