Function objects

 

C++

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Utilities library

 

Function objects

Operator wrappers
plus minus negate multiplies divides modulus logical_and logical_or logical_not	equal_to not_equal_to greater less greater_equal less_equal bit_and bit_or bit_xor
Negators
unary_negate binary_negate	not1 not2
Bind
bind (C++11)
is_bind_expression (C++11)
is_placeholder (C++11)
_1, _2, _3, ... (C++11)
Function wrappers
mem_fn (C++11)
function (C++11)
bad_function_call (C++11)
Reference wrappers
reference_wrapper (C++11)
ref cref (C++11) (C++11)
Deprecated binders and adaptors
unary_function (deprecated)
binary_function (deprecated)
ptr_fun (deprecated)
pointer_to_unary_function (deprecated)
pointer_to_binary_function (deprecated)
mem_fun (deprecated)
mem_fun_t mem_fun1_t const_mem_fun_t const_mem_fun1_t (deprecated) (deprecated) (deprecated) (deprecated)
mem_fun_ref (deprecated)
mem_fun_ref_t mem_fun1_ref_t const_mem_fun_ref_t const_mem_fun1_ref_t (deprecated) (deprecated) (deprecated) (deprecated)
binder1st binder2nd (deprecated) (deprecated)
bind1st bind2nd (deprecated) (deprecated)

 

A function object is any object for which the function call operator is defined.

Function objects
Arithmetic operations
plus	function object implementing x + y (class template)
minus	function object implementing x - y (class template)
multiplies	function object implementing x * y (class template)
divides	function object implementing x / y (class template)
modulus	function object implementing x % y (class template)
negate	function object implementing -x (class template)
Comparisons
equal_to	function object implementing x == y (class template)
not_equal_to	function object implementing x != y (class template)
greater	function object implementing x > y (class template)
less	function object implementing x < y (class template)
greater_equal	function object implementing x >= y (class template)
less_equal	function object implementing x <= y (class template)
Logical operations
logical_and	function object implementing x && y (class template)
logical_or	function object implementing x || y (class template)
logical_not	function object implementing !x (class template)
Bitwise operations
bit_and	function object implementing x & y (class template)
bit_or	function object implementing x | y (class template)
bit_xor	function object implementing x ^ y (class template)
Negators
unary_negate	wrapper function object returning the complement of the unary predicate it holds (class template)
binary_negate	wrapper function object returning the complement of the binary predicate it holds (class template)
not1	constructs custom std::unary_negate object (function template)
not2	constructs custom std::binary_negate object (function template)

Bind

bind (C++11)	binds one or more arguments to a function object (function template)
is_bind_expression (C++11)	indicates that an object is std::bind expression or can be used as one (class template)
is_placeholder (C++11)	indicates that an object is a standard placeholder or can be used as one (class template)
Defined in namespace std::placeholders
_1, _2, _3, _4, ... (C++11)	placeholders for the unbound arguments in a std::bind expression (constant)
Polymorphic function wrappers
mem_fn (C++11)	binds an object to a pointer to its member function to form independent function object (function template)
function (C++11)	wraps callable object of any type with specified function call signature (class template)
bad_function_call (C++11)	the exception thrown when invoking an empty std::function (class)

Reference wrappers
reference_wrapper (C++11)	CopyConstructible and CopyAssignable reference wrapper (class template)
ref cref (C++11) (C++11)	creates a reference_wrapper of type, deduced from its argument (function template)

Deprecated in C++11
Base
unary_function (deprecated)	adaptor-compatible unary function base class (class template)
binary_function (deprecated)	adaptor-compatible binary function base class (class template)
Binders
binder1st binder2nd (deprecated) (deprecated)	function object holding a binary function and one of its arguments (class template)
bind1st bind2nd (deprecated) (deprecated)	binds one argument to a binary function (function template)
Function adaptors
pointer_to_unary_function (deprecated)	adaptor-compatible wrapper for a pointer to unary function (class template)
pointer_to_binary_function (deprecated)	adaptor-compatible wrapper for a pointer to binary function (class template)
ptr_fun (deprecated)	creates an adaptor-compatible function object wrapper from a pointer to function (function template)
mem_fun_t mem_fun1_t const_mem_fun_t const_mem_fun1_t (deprecated) (deprecated) (deprecated) (deprecated)	wrapper for a pointer to nullary member function, callable with a pointer to object (class template)
mem_fun (deprecated)	creates a wrapper from a pointer to member function, callable with a pointer to object (function template)
mem_fun_ref_t mem_fun1_ref_t const_mem_fun_ref_t const_mem_fun1_ref_t (deprecated) (deprecated) (deprecated) (deprecated)	wapper for a pointer to nullary or unary member function, callable with a reference to object (class template)
mem_fun_ref (deprecated)	creates a wrapper from a pointer to member function, callable with a reference to object (function template)