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

22 Nov 2014


      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@gmail.com
To: boost@lists.boost.org
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, "胡维" <huwei04@hotmail.com> 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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