1// All the pointer_to_binary_function cases used to fail because g++
2// couldn't handle converting an overloaded function to a class type.
3// The first one should still fail because it requires an implicit conversion
4// to pointer_to_binary_function, which has an `explicit' constructor.
5
6#include <vector>
7#include <algorithm>
8#include <functional>
9
10using namespace std;
11
12template <class T> class Expr
13{
14public :
15  Expr(){};
16  Expr(const T&){};
17};
18
19template <class T >
20inline bool compare(const Expr<T> a, const Expr<T> b){ return true; };
21
22int main()
23{
24  vector<int>	a(3);
25  sort( a.begin(), a.end(),
26	static_cast<bool (*)(const Expr<int>,const Expr<int>)>(compare) );
27  sort( a.begin(), a.end(), compare<int> );
28  sort<vector<int>::iterator,
29       pointer_to_binary_function<const Expr<int>, const Expr<int>, bool> >
30    ( a.begin(), a.end(), compare ); // ERROR - constructor is explicit
31  sort( a.begin(), a.end(),
32	ptr_fun<const Expr<int>, const Expr<int>, bool> (compare) );
33  sort( a.begin(), a.end(),
34	ptr_fun(compare<int>) );
35  sort( a.begin(), a.end(),
36	pointer_to_binary_function<const Expr<int>, const Expr<int>, bool>(compare) );
37  sort( a.begin(), a.end(),
38	pointer_to_binary_function<const Expr<int>, const Expr<int>, bool>(compare<int>) );
39  sort( a.begin(), a.end(),
40	pointer_to_binary_function<const Expr<int>, const Expr<int>, bool>(compare<>) );
41}
42