C++11 functionality with MinGW

Question

I try to use emplace() function for an unordered_map and compiler says that no such function exists.

I put -std=c+11 and it says cc1plus.exe: error: unrecognized command line option '-std=c+11'

Can i somehow use C++11 functionality with mingw?

'class std::unordered_map, dictionaryWord>' has no member named 'emplace'. Emplace is defined in c++11. So i need to add c++11 support, but when i do it sais: unrecognized command line option '-std=c+11' — pdrak, Apr 21 '13 at 21:32
Well, just look at '-std=c+11'. You only have single plus character here. — milleniumbug, Apr 21 '13 at 21:33
What version is your MinGW (You can check with `gcc -v`)? `std=c++11` was introduced relatively recently. — milleniumbug, Apr 21 '13 at 22:03
@PetrosDrakoulis: Then maybe it's not available on that version. MinGW is up to 4.7.2 now. — Nicol Bolas, Apr 22 '13 at 05:42

TemplateRex · Answer 1 · 2013-04-22T15:02:10.440

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C++0x was the working name of a new ISO C++ standard, which was then released in 2011 as C++11 and introduces a host of new features into the standard C++ language and library. This project seeks to implement new C++11 features in GCC and to make it one of the first compilers to bring C++11 to C++ programmers.

C++11 features are available as part of the "mainline" GCC compiler in the trunk of GCC's Subversion repository and in GCC 4.3 and later. To enable C++0x support, add the command-line parameter -std=c++0x to your g++ command line. Or, to enable GNU extensions in addition to C++0x extensions, add -std=gnu++0x to your g++ command line. GCC 4.7 and later support -std=c++11 and -std=gnu++11 as well.

So, for gcc 4.3 through 4.6 use -std=c++0x, for later version use -std=c++11. Library support for map::emplace was added in gcc 4.8

edited Apr 22 '13 at 15:02

answered Apr 22 '13 at 09:51

TemplateRex

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same error: 'class std::unordered_map, dictionaryWord>' has no member named 'emplace' – pdrak Apr 22 '13 at 13:40
I have come to believe that i can not use c++ 11, or at least all of it, with 4.6. – pdrak Apr 22 '13 at 13:47
1

You will need gcc 4.8 to use `map::emplace`, see e.g. [this question](http://stackoverflow.com/questions/14075128/mapemplace-with-a-custom-value-type) – TemplateRex Apr 22 '13 at 14:45
The project i try to compile for windows, was made in Linux Gcc 4.7.2 a month ago. There is emplace() in linux gcc 4.7.2 – pdrak Apr 22 '13 at 18:19
@PetrosDrakoulis That's surprising because the [gcc 4.7.2 docs](http://gcc.gnu.org/onlinedocs/gcc-4.7.2/libstdc++/manual/manual/status.html#status.iso.2011) says that `emplace` is missing for `map`. See also http://ideone.com/dqScM9 Safe bet is to install MinGW 4.8, e.g. from http://nuwen.net/mingw.html – TemplateRex Apr 22 '13 at 18:57
Thank you. I will try to do so. But i guarantee you that in Linux gcc 4.7.2 with flag -std=c+11 there is emplace() for unordered_map. I participated in a contest 2 weeks ago and with the compiler being 4.7.2 i used it. It's the very program i try to recompile for windows... – pdrak Apr 22 '13 at 19:28

C++11 functionality with MinGW

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