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Template argument (pointer to member function) initialization with NULL
- From: "vagran.ast" <vagran dot ast at gmail dot com>
- To: gcc-help at gcc dot gnu dot org
- Date: Mon, 14 Nov 2011 22:22:50 +0200
- Subject: Template argument (pointer to member function) initialization with NULL
Hi,
In the following code:
class A {
public:
void SomeMethod() { }
};
template <class T, void (T::*SomeMethod)() = 0>
class B {
};
B<A> b1; // error: could not convert template argument '0' to 'void
(A::*)()'
B<A, 0> b2; // error: could not convert template argument '0' to 'void
(A::*)()'
void (A::*someMethod)() = 0; // OK
there are two compilation errors. AFAIK per C++ standard 0 is a valid
value for a pointer to member
function. Variable of such type can be successfully initialized by 0 but
template arguments can not.
Is it desired behavior or a bug?
gcc version 4.6.1