A function is a C language construct that associates a compound statement (the function body) with an identifier (the function name). Every C program begins execution from the main function, which either …

Function declaration Function declarations may appear in any scope. A function declaration at class scope introduces a class member function (unless the friend specifier is used), see member …

Class template std::function is a general-purpose polymorphic function wrapper. Instances of std::function can store, copy, and invoke any CopyConstructible Callable target -- functions (via …

A function declaration may appear in any scope, but a function definition may only appear in namespace scope or, for member and friend functions, in class scope. A function that is declared in a class body …

A function definition associates the function body (a sequence of declarations and statements) with the function name and parameter list. Unlike function declaration, function definitions are allowed at file …

A function declaration introduces an identifier that designates a function and, optionally, specifies the types of the function parameters (the prototype). Function declarations (unlike definitions) may …

A function object is any object for which the function call operator is defined. C++ provides many built-in function objects as well as support for creation and manipulation of new function objects.

Destroys the std::function instance. If the std::function is not empty, its target is destroyed also. See also

std::function 's allocator support was poorly specified and inconsistently implemented. Some implementations do not provide overloads (6-10) at all, some provide the overloads but ignore the …

Main function A program shall contain a global function named main, which is the designated start of the program in hosted environment. It shall have one of the following forms: