[boost] Re: Function type to function call, how to?

4 Jun 2005

      Arkadiy Vertleyb wrote:
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"Jonathan Turkanis"  wrote
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Arkadiy Vertleyb wrote:
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Given a function type F, and parameter type T, how to create an
expression for typeof to use in the return type?  I use VC71, and
the only thing that seems to work (but with a warning) is:
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I'm not sure if this if what you have in mind, but the following
compiles without warning with VC7.1, como and GCC 3.4:
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Actually here is a minimal example of what I meant:
template<int n> struct int_;
template<class F>
int_<sizeof( (*(F*)0)() )> foo(); // doesn't compile in VC71
It compiles with GCC 3.4.2, como 4.3.3 (strict) and CodeWarrior 9.4. Looks like
ETI.

BTW, you can avoid dereferencing a null pointer by using a helper struct with a
static member.

Jonathan