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Description

Mem_fun1_t is an adaptor for member functions. If X is some class with a member function Result X::f(Arg) (that is, a member function that takes one argument of type Arg and that returns a value of type Result [1]), then a mem_fun1_t is a function object adaptor that makes it possible to call f as if it were an ordinary function instead of a member function.

Mem_fun1_t's constructor takes a pointer to one of X's member functions. Then, like all function objects, mem_fun1_t has an operator() that allows the mem_fun1_t to be invoked with ordinary function call syntax. In this case, mem_fun1_t's operator() takes two arguments; the first is of type X* and the second is of type Arg.

If F is a mem_fun1_t that was constructed to use the member function X::f, and if x is a pointer of type X* and a is a value of type Arg, then the expression F(x, a) is equivalent to the expression x->f(a). The difference is simply that F can be passed to STL algorithms whose arguments must be function objects.

Mem_fun1_t is one of a family of member function adaptors. These adaptors are useful if you want to combine generic programming with inheritance and polymorphism, since, in C++, polymorphism involves calling member functions through pointers or references.

As with many other adaptors, it is usually inconvenient to use mem_fun1_t's constructor directly. It is usually better to use the helper function mem_fun [2] instead.


mem_fun1_t < Result, X, Arg > | Standard Template Library Programmer`s Guide | Example







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