“to_string” isn’t a member of “std”?

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you may want to specify the C++ version with

g++ -std=c++11 tmp.cpp -o tmp

I don’t have gcc 4.8.1 at hand , but in older versions of GCC,
you can use

g++ -std=c++0x tmp.cpp -o tmp

At least gcc 4.9.2 I believe also support part of C++14 by specifying

g++ -std=c++1y tmp.cpp -o tmp

Update:
gcc 5.3.0 (I am using the cygwin version) supports both -std=c++14 and -std=c++17 now.

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