[header][other] functional

*[header][other] functional

<functional>

Function objects

Function objects are objects specifically designed to be used with a syntax similar to that of functions. In C++, this is achieved by defining member function operator() in their class, like for example:

1 2 3 4

struct myclass { int operator()(int a) {return a;} } myobject; int x = myobject (0); // function-like syntax with object myobject

They are typically used as arguments to functions, such as predicates or comparison functions passed to standard algorithms.

• C++98
• C++11

Base classes

unary_function

Unary function object base class (class template )

binary_function

Binary function object base class (class template )

Operator classes

Arithmetic operations:

plus

Addition function object class (class template )

minus

Subtraction function object class (class template )

multiplies

Multiplication function object class (class template )

divides

Division function object class (class template )

modulus

Modulus function object class (class template )

negate

Negative function object class (class template )

Comparison operations:

equal_to

Function object class for equality comparison (class template )

not_equal_to

Function object class for non-equality comparison (class template )

greater

Function object class for greater-than inequality comparison (class template )

less

Function object class for less-than inequality comparison (class template )

greater_equal

Function object class for greater-than-or-equal-to comparison (class template )

less_equal

Function object class for less-than-or-equal-to comparison (class template )

Logical operations:

logical_and

Logical AND function object class (class template )

logical_or

Logical OR function object class (class template )

logical_not

Logical NOT function object class (class template )

Adaptor and conversion functions

Negators

not1

Return negation of unary function object (function template )

not2

Return negation of binary function object (function template )

Parameter binders

bind1st

Return function object with first parameter bound (function template )

bind2nd

Return function object with second parameter bound (function template )

Conversors

ptr_fun

Convert function pointer to function object (function template )

mem_fun

Convert member function to function object (pointer version) (function template )

mem_fun_ref

Convert member function to function object (reference version) (function template )

Instrumental types

unary_negate

Negate unary function object class (class template )

binary_negate

Negate binary function object class (class template )

binder1st

Generate function object class with 1st parameter bound (class template )

binder2nd

Generate function object class with 2nd parameter bound (class template )

pointer_to_unary_function

Generate unary function object class from pointer (class template )

pointer_to_binary_function

Generate binary function object class from pointer (class template )

mem_fun_t

Generate function object class from parameterless member (pointer version) (class template )

mem_fun1_t

Generate function object class from single-parameter member (pointer version) (class template )

const_mem_fun_t

Generate function object class from const parameterless member (pointer version) (class template )

const_mem_fun1_t

Generate function object class from single-parameter const member (pointer version) (class template )

mem_fun_ref_t

Generate function object class from parameterless member (reference version) (class template )

mem_fun1_ref_t

Generate function object class from single-parameter member (reference version) (class template )

const_mem_fun_ref_t

Generate function object class from const parameterless member (reference version) (class template )

const_mem_fun1_ref_t

Generate function object class from single-parameter const member (reference version) (class template )

• C++98
• C++11

Functions

These functions create objects of wrapper classes based on its arguments:

bind 

Bind function arguments (function template )

cref 

Construct reference_wrapper to const (function template )

mem_fn 

Convert member function to function object (function template )

not1

Return negation of unary function object (function template )

not2

Return negation of binary function object (function template )

ref 

Construct reference_wrapper (function template )

Classes

Wrapper classes

Wrapper classes are classes that hold an object and have an interface similar to that object, but adding or changing some of its features:

binary_negate

Negate binary function object class (class template )

function 

Function wrapper (class template )

reference_wrapper 

Reference wrapper (class template )

unary_negate

Negate unary function object class (class template )

Operator classes

Operator classes are classes that define functional objects that call operators:

bit_and 

Bitwise AND function object class (class template )

bit_or 

Bitwise OR function object class (class template )

bit_xor 

Bitwise XOR function object class (class template )

divides

Division function object class (class template )

equal_to

Function object class for equality comparison (class template )

greater

Function object class for greater-than inequality comparison (class template )

greater_equal

Function object class for greater-than-or-equal-to comparison (class template )

less

Function object class for less-than inequality comparison (class template )

less_equal

Function object class for less-than-or-equal-to comparison (class template )

logical_and

Logical AND function object class (class template )

logical_not

Logical NOT function object class (class template )

logical_or

Logical OR function object class (class template )

minus

Subtraction function object class (class template )

modulus

Modulus function object class (class template )

multiplies

Multiplication function object class (class template )

negate

Negative function object class (class template )

not_equal_to

Function object class for non-equality comparison (class template )

plus

Addition function object class (class template )

Other classes

bad_function_call 

Exception thrown on bad call (class )

hash 

Default hash function object class (class template )

is_bind_expression 

Is bind expression (class template )

is_placeholder 

Is placeholder (class template )

Namespaces

placeholders 

Bind argument placeholders (namespace )

내용 출처 : http://www.cplusplus.com/reference/functional/