mem_fun_ref_t Class

Article
08/03/2021

An adapter class that allows a non_const member function that takes no arguments to be called as a unary function object when initialized with a reference argument. Deprecated in C++11, removed in C++17.

Syntax

template <class Result, class Type>
class mem_fun_ref_t : public unary_function<Type, Result> {
    explicit mem_fun_ref_t(
    Result (Type::* _Pm)());

    Result operator()(Type& left) const;
};

Parameters

_Pm
A pointer to the member function of class Type to be converted to a function object.

left
The object that the _Pm member function is called on.

Return Value

An adaptable unary function.

Remarks

The class template stores a copy of _Pm, which must be a pointer to a member function of class Type, in a private member object. It defines its member function operator() as returning (left.* _Pm)().

Example

The constructor of mem_fun_ref_t is not usually used directly; the helper function mem_fun_ref is used to adapt member functions. See mem_fun_ref for an example of how to use member function adaptors.

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