const_mem_fun1_t Class

Article
08/03/2021

An adapter class that allows a const member function that takes a single argument to be called as a binary function object when initialized with a pointer argument. Deprecated in C++11, removed in C++17.

Syntax

template <class Result, class Type, class Arg>
class const_mem_fun1_t : public binary_function<const Type *, Arg, Result>
{
    explicit const_mem_fun1_t(Result (Type::* member_ptr)(Arg) const);
    Result operator()(const Type* left, Arg right) const;
};

Parameters

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

left
The const object that the member_ptr member function is called on.

right
The argument that is being given to member_ptr.

Return Value

An adaptable binary function.

Remarks

The class template stores a copy of member_ptr, 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->member_ptr)(right) const.

Example

The constructor of const_mem_fun1_t is rarely used directly. mem_fn is used to adapt member functions. See mem_fn for an example of how to use member function adaptors.

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