bslmf_memberpointertraits

Detailed Description

Outline

• Purpose
• Classes
• Description
  • Usage

Purpose

Provide meta-function to detect pointer to member traits.

Classes

• bslmf::MemberPointerTraits: meta-function to get member pointer traits

See also

bslmf_memberfunctionpointertraits

Description

This component provides a meta-function, bslmf::MemberPointerTraits, that determines traits of a pointer-to-member type, including the type of the object that it is a member of, and the type of the member it addresses.

Usage

Define the following struct with the following members:

struct MyTestClass {
    int func1(int) { return 0; }
    int d_int;
};

In order to deduce the types of func1 and d_int, we will use bslmf::MemberPointerTraits.

template <class MEMBER, class CLASS, class t_TYPE>
void checkMemberPointer(t_TYPE pointer)
{
    (void) pointer;
    typedef typename bslmf::MemberPointerTraits<t_TYPE>::MemberType
        MemberType;
    typedef typename bslmf::MemberPointerTraits<t_TYPE>::ClassType
        ClassType;
    assert(1 == (bsl::is_same<MemberType, MEMBER>::value));
    assert(1 == (bsl::is_same<ClassType, CLASS>::value));
}

The following program should compile and run without errors:

void usageExample()
{
    checkMemberPointer<int(int), MyTestClass>(&MyTestClass::func1);
    checkMemberPointer<int, MyTestClass>(&MyTestClass::d_int);
}