Re: [Boost-users] a difference of boost.function between g++4.13 and vc8

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-03-02 14:47:34

AMDG

Ç®ÏþÃ÷ wrote:
> I wrote some code using boost.function. Compiling it both in g++4.13
> and vc8, I find that I can not declare a struct in function with
> operator() and use boost.function to call it when I use g++. Just like
> this:
>
> int main() {
> struct int_div {
> float operator()(int x, int y) const { return ((float)x)/y; };
> };
> boost::function<float (int x, int y)> f = int_div();
> std::cout << f(5, 3) << std::endl;
> return 0;
> }
> When I compile the code above in g++, it give me the error : ÇëÇó´Ó
> 'main()::int_div' ת»»µ½·Ç±êÁ¿ÀàÐÍ 'boost::function<float ()(int,
> int), std::allocator<void> >'(I use ubuntu chinese.)
> but when I move the int_div definition outside of main(), It is ok!
> And the code above VC8 can compile it!
> why?

The above code is illegal. You are not allowed to pass a local class to
a template.
Try moving int_div outside main.

In Christ,
Steven Watanabe