make_unique

[SECMoG1T]

Hello , is there a way i can make this function supported by Gcc, everytime i need it i hve to provide it's definition , and some times i get alot of errors

[mutexe]

http://stackoverflow.com/questions/16886591/how-do-i-enable-c11-in-gcc

[SECMoG1T]

ohh thank you @mutexe but i have my gcc suport c++ 11- Gnu gcc 4.9.2 by default so that might not be the issue , the problem is i can't use std::make_unique if i need it i'll have to define a function n thet is quite problematic .

[mutexe]

what error messages do you get if you try and compile this:

#include<memory>

int main()
{
	std::unique_ptr<int> pPointer = std::make_unique<int>();
	return 0;
}

?

[SECMoG1T]

||=== Build: Debug in eostro (compiler: GNU GCC Compiler) ===|
C:\Users\Orion\Desktop\p.l\eostro\tester.cpp|17|error: 'make_unique' is not a member of 'std'|
||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 1 second(s)) ===|

if i need it i'll provide this def and use it as an alternative, and that's what i want to avoid

template< class T, class... ARGS >
std::unique_ptr<T> make_unique( ARGS&&... my_args )
{
   return std::unique_ptr<T>(new T(std::forward<ARGS>(my_args)...));
}

Note : the function is supported on my vs 13, the problem is that sometimes it fails to build my projects for some unknown reasons and am forced to use gcc.

[coder777]

make_unique is not part of C++11 but c++14. See:

http://en.cppreference.com/w/cpp/memory/unique_ptr/make_unique

[mutexe]

Balls. My mistake sorry.

[SECMoG1T]

oh yea it's a c++ 14 feature ,but what should i do next?

[coder777]

There is not much you can do. Either you look for a compiler that supports it or you doing it yourself and replace it as soon as it is available.

[SECMoG1T]

ooh GOD! then maybe i should sort out my problem with vs - does anyone know what to do with this bug - i have tried a million solutions and none worked

but sometimes vs will works just fine.

Unable to start program 'c:\Users\Orion\documents\visual studio 2013 \Projects\BD_ST\Debug\BD_ST.exe'.

system can't find the file specified.

or what other compiler do you recommend , i thought GNU gcc 4.9.2 should support that.

[JLBorges]

Create a header which can be reused. Something like this:

#ifndef MAKE_UNIQUE_H_INCLUDED
#define MAKE_UNIQUE_H_INCLUDED

#include <memory>
#include <utility>

namespace util
{
    #if __cplusplus == 201402L // C++14

        using std::make_unique ;

    #else // C++11

        template < typename T, typename... CONSTRUCTOR_ARGS >
        std::unique_ptr<T> make_unique( CONSTRUCTOR_ARGS&&... constructor_args )
        { return std::unique_ptr<T>( new T( std::forward<CONSTRUCTOR_ARGS>(constructor_args)... ) ); }

    #endif // __cplusplus == 201402L
}


#endif // MAKE_UNIQUE_H_INCLUDED 

http://coliru.stacked-crooked.com/a/cb9baad37307f5cd

[SECMoG1T]

ooh thank you @JLBorges i did add that header but in my current project so it works so well when i use it like this:

#include "my_util.h"

int main()
{
   std::unique_ptr<int> ptr=util::make_unique<int>(10);
   std::cout<<*ptr<<std::endl;
}

10

Is it possible to make the util header part of the my IDE so that when i need to use it i'll not need to hunt around for the project containing the header? that will be a cool solution.

[coder777]

make_unique isn't necessary. You can always write it like so:

std::unique_ptr<int> ptr(new int(10));

[SECMoG1T]

@coder777 thanks you very much.