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TUTORIALS
REFERENCE
ARTICLES
FORUM

C++

Tutorials
Reference
Articles
Forum

Reference

C library:
- <cassert> (assert.h)
- <cctype> (ctype.h)
- <cerrno> (errno.h)
- C++11
  <cfenv> (fenv.h)
- <cfloat> (float.h)
- C++11
  <cinttypes> (inttypes.h)
- <ciso646> (iso646.h)
- <climits> (limits.h)
- <clocale> (locale.h)
- <cmath> (math.h)
- <csetjmp> (setjmp.h)
- <csignal> (signal.h)
- <cstdarg> (stdarg.h)
- C++11
  <cstdbool> (stdbool.h)
- <cstddef> (stddef.h)
- C++11
  <cstdint> (stdint.h)
- <cstdio> (stdio.h)
- <cstdlib> (stdlib.h)
- <cstring> (string.h)
- C++11
  <ctgmath> (tgmath.h)
- <ctime> (time.h)
- C++11
  <cuchar> (uchar.h)
- <cwchar> (wchar.h)
- <cwctype> (wctype.h)
Containers:
- C++11
  <array>
- <deque>
- C++11
  <forward_list>
- <list>
- <map>
- <queue>
- <set>
- <stack>
- C++11
  <unordered_map>
- C++11
  <unordered_set>
- <vector>
Input/Output:
- <fstream>
- <iomanip>
- <ios>
- <iosfwd>
- <iostream>
- <istream>
- <ostream>
- <sstream>
- <streambuf>
Multi-threading:
- C++11
  <atomic>
- C++11
  <condition_variable>
- C++11
  <future>
- C++11
  <mutex>
- C++11
  <thread>
Other:
- <algorithm>
- <bitset>
- C++11
  <chrono>
- C++11
  <codecvt>
- <complex>
- <exception>
- <functional>
- C++11
  <initializer_list>
- <iterator>
- <limits>
- <locale>
- <memory>
- <new>
- <numeric>
- C++11
  <random>
- C++11
  <ratio>
- C++11
  <regex>
- <stdexcept>
- <string>
- C++11
  <system_error>
- C++11
  <tuple>
- C++11
  <type_traits>
- C++11
  <typeindex>
- <typeinfo>
- <utility>
- <valarray>

<functional>

functions
- C++11
  bind
- C++11
  cref
- C++11
  mem_fn
- not1
- not2
- C++11
  ref
wrapper classes
- binary_negate
- C++11
  function
- C++11
  reference_wrapper
- unary_negate
operator classes
- C++11
  bit_and
- C++11
  bit_or
- C++11
  bit_xor
- divides
- equal_to
- greater
- greater_equal
- less
- less_equal
- logical_and
- logical_not
- logical_or
- minus
- modulus
- multiplies
- negate
- not_equal_to
- plus
other classes
- C++11
  bad_function_call
- C++11
  hash
- C++11
  is_bind_expression
- C++11
  is_placeholder
namespaces
- C++11
  placeholders
deprecated

Reference
<functional>

header

<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:

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.

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)

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)

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Original Source | Taken Source

functions

wrapper classes

operator classes

other classes

namespaces

deprecated

<functional>

Base classes

Operator classes

Adaptor and conversion functions

Instrumental types

Functions

Classes

Wrapper classes

Operator classes

Other classes

Namespaces