stoi is not a member of std?

[Hashirama senju]

I am using code::blocks version 13.12 and tried to compile this code.

#include <string>
int main(){
    std::string s = "42";
    int i = std::stoi(s);
}

It give me an error saying that 'stoi' is not a member of std, though I am sure that it is, in C++11.
I have also enabled the C++11 in the compiler flag.
Googling this yielded some results saying that MinGW does not support stoi,to_string() and such string-numeric conversion functions. Is there any other compiler I can use which supports C++11 as much as MinGW?
I am using Windows 7 32bit.
P.S it runs fine on http://cpp.sh

[Renthalkx97]

You could use Visual Studio.

[Hashirama senju]

It's really good, but does not support C++11 as much as MinGW. Moreover, it looks horrible for C++ coding. Very less auto completion compared to Code blocks.

[MiiNiPaa]

Latest versions of MinGW.
Visual Studio compilers.

[Hashirama senju]

MiiNiPaa, I didn't understand your post, can you elaborate a little bit?
Do you mean that latest versions of MinGW, fixed the stoi(),.. issues?

[JLBorges]

This 64-bit build of MinGW has std::stoi() http://nuwen.net/mingw.html
So I would guess that a current 32-bit build (GCC 4.9.1) would have it too.

For a standard C++ library implementation way better than what GNU offers:
Visual Studio Express 2013 (Desktop): http://www.microsoft.com/en-us/download/details.aspx?id=44914

With the LLVM toolchain for Visual Studio, http://llvm.org/builds/ we also get the best C++ compiler on Windows.

A workaround (assumes that std::strtol() is available):
http://www.cplusplus.com/forum/beginner/120836/#msg657958

[Renthalkx97]

I've never used Code Blocks but VS can auto complete pretty much anything that intellisense picks up. I'm using VS 2013 Professional so it may be different on different versions.

[MiiNiPaa]

Yes. It works fine now. And fix to that problem was avaliable for a long time.
there some links to alternative MinGW builds
http://www.cplusplus.com/forum/beginner/149018/#msg780232

Alternatively you could try to build clang.

[Hashirama senju]

For a standard C++ library implementation way better than what GNU offers:
Visual Studio Express 2013 (Desktop): http://www.microsoft.com/en-us/download/details.aspx?id=44914

I heard that visual C++ does not support `constexpr` fully. And `initializer_list` too.

With the LLVM toolchain for Visual Studio, http://llvm.org/builds/ we also get the best C++ compiler on Windows.

Is LLVM a compiler like GCC?

[Renthalkx97]

initiaizer_list's are supported. constexpr however is not.

[JLBorges]

> I heard that visual C++ does not support `constexpr` fully. And `initializer_list` too.

The current version of the Microsoft compiler does not support constexpr
It has complete support for initializer lists.
For other C++11 features, see: http://msdn.microsoft.com/en-us/library/hh567368.aspx


> Is LLVM a compiler like GCC?

clang++ is the C++ compiler from LLVM. http://clang.llvm.org/
libc++ is their implementation of the standard C++ library (not available on Windows): http://libcxx.llvm.org/

[MiiNiPaa]

> It has complete support for initializer lists.
VS2015 preview lists it as Partial:

NSDMIs and initializer lists were previously listed as Yes, but have been downgraded to Partial

http://blogs.msdn.com/b/vcblog/archive/2014/11/17/c-11-14-17-features-in-vs-2015-preview.aspx
It also has a partial constexpr implementation.

[Hashirama senju]

clang++ is the C++ compiler from LLVM. http://clang.llvm.org/
libc++ is their implementation of the standard C++ library (not available on Windows): http://libcxx.llvm.org/

That means I can't use it on windows? :O

[JLBorges]

> That means I can't use it on windows?

You can use the LLVM compiler (clang++) with the Microsoft library.

You would get a compiler that is somewhat better than than the GNU compiler, and a library that is a lot better than the GNU library.

[Hashirama senju]

You can use the LLVM compiler (clang++) with the Microsoft library.

You would get a compiler that is somewhat better than than the GNU compiler

Cool, thanks a lot.

So What I have to do is just install Visual studio express, and clang++?
Is there any tutorial for this?
Will using another compiler have any effect on the VS debugger?

and a library that is a lot better than the GNU library.

Why do you say it is better? It does not support C++11 as much as GCC.

[MiiNiPaa]

VS has subpar support for core language features. Standard library is more or less complete (and it works better on Windows than libstdc++)
http://msdn.microsoft.com/en-us/library/hh567368.aspx
Scroll to Standard Library Features. Note that almost all defects were fixed in VS2012 and now as article states:

As for the C++11 Standard Library, we don't have a pretty comparison table of features, but Visual C++ in Visual Studio 2012 implemented it, with two exceptions. First, when a library feature depended on functionality that was missing in the compiler, it was either simulated—for example, simulated variadic templates for make_shared<T>()—or it wasn't implemented. (There were only a few cases—most notably, <initializer_list>—which are now fully implemented in Visual C++ in Visual Studio 2013.) With very few exceptions, C99 has been implemented in Visual C++ in Visual Studio 2013 and C++ wrapper headers provided.

[Hashirama senju]

Hmm, Ok. I am away from my desktop(Which has visual studio) right now. But I will check it again when I get home after some days. I will update the topic then. :)

[JLBorges]

> It does not support C++11 as much as GCC

GNU libstdc++ has truly vast expanses of non-conformance (on all platforms).

IMHO, while a lot of it can be tolerated, these are show-stoppers:

Non-conforming std::basic_string (suffers from the mad-cow disease).

Non-conforming std::list<> (not an allocator-aware container, O(N) size())

Virtually no support for localization (missing standard code conversion facets). On non-linux platforms, there are no locales either (other than the classic and default locales).

Broken C++11 thread-safety.

[Hashirama senju]

Ok, I got visual studio professional and Visual assist X trials, and I am not going to go back to code blocks again. Previously visual studio's syntax highlighting and all was not very good but visual assist made it a 10000X better then code blocks.

Anyway, I will use Visual C++ compiler even if it does not fully support C++11 right now. Thanks for the suggestions.

P.S it supports stoi as well :).