const_mem_fun_t Class
An adapter class that allows a 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 const_mem_fun_t : public unary_function <Type *, Result>
{
explicit const_mem_fun_t(Result (Type::* Pm)() const);
Result operator()(const Type* Pleft) const;
};
Parameters
Pm
A pointer to the member function of class Type
to be converted to a function object.
Pleft
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 (Pleft
->* Pm
)() const
.
Example
The constructor of const_mem_fun_t
is not usually used directly; the helper function mem_fun
is used to adapt member functions. See mem_fun for an example of how to use member function adaptors.
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