Re: [boost] Is there interest in a library for testing existence of a function member of class?

Subject: Re: [boost] Is there interest in a library for testing existence of a function member of class?
From: ºúά (huwei04_at_[hidden])
Date: 2014-11-22 10:33:17

Thanks, Sylvain to point to that. :)The use case is similar and a little different.Boost Concept Check will fail if not meet requirements.I would like a way to test it and return boolean.
For example, I would like do something like below:
struct default_foo{    void foo();};
struct user_foo{    void foo();};
template <typename T>void call_foo(typename if_<has_foo<void(T::*)()>::value, T, default_foo>::type u){   u.foo();}
Thanks,Wei

> Date: Sat, 22 Nov 2014 22:44:49 +0800
> From: sylvain.bougerel.devel_at_[hidden]
> To: boost_at_[hidden]
> Subject: Re: [boost] Is there interest in a library for testing existence of a function member of class?
> 
> Hi Wei,
> 
> Have you checked Boost Concept Check library, it looks like it could fit
> your use case.
> 
> Regards, Sylvain
> On 22 Nov 2014 22:33, "ºúά" <huwei04_at_[hidden]> wrote:
> 
> > Hi,
> > I am looking for how to test if a function member of class exist or not in
> > compile time.I did not find a solution by google so I wrote a piece of code
> > for it.Please let me know if it's already in boost. :)
> > Synopsis
> > class Bar
> > {
> > public:
> >   Bar(int);
> > };
> >
> > class Foo
> > {
> > public:
> >   Foo(int);
> >   int foo(Bar);
> > };
> >
> > // create struct 'has_foo' which is used to test function member
> > 'foo'.HAS_FUNCTION_MEMBER(foo)
> >
> > int main()
> > {
> >    assert((!has_foo<void(Bar::*)(Bar)>::value));
> >    assert((has_foo<int(Foo::*)(Bar)>::value));
> >    return 0;
> > }
> > The code is in my gisthttps://gist.github.com/wehu/1987f716074904d26cf0

> > The code only checks if the function is compatible with expected, but not
> > require to be exact same.
> > Thanks,Wei
> >
> >
> >
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> 
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