C++ keyword: constexpr (since C++11)

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros

(C++20)

Language support library

Concepts library

(C++20)

Diagnostics library

Memory management library

Metaprogramming library

(C++11)

General utilities library

Containers library

Iterators library

Ranges library

(C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library

(C++17)

Concurrency support library

(C++11)

Execution control library

(C++26)

Technical specifications

Symbols index

External libraries

C++ language

General topics

Preprocessor

Comments

Keywords

Escape sequences

Flow control

Conditional execution statementsIteration statements (loops)

for

range-for

(C++11)

while

do-while

Jump statements

continue

goto

break

return

Functions

Function declaration

Lambda function expression

inline specifier

Dynamic exception specifications

(until C++17*)

noexcept specifier

(C++11)Exceptions

throw-expression

try block

catch handler

NamespacesTypes

Fundamental types

Enumeration types

Function types

Class/struct types

Union types

Specifiers

const/volatile

decltype

(C++11)

auto

(C++11)

constexpr

(C++11)

consteval

(C++20)

constinit

(C++20)

Storage duration specifiers

Initialization

Default-initialization

Value-initialization

Zero-initialization

Copy-initialization

Direct-initialization

Aggregate initialization

List-initialization

(C++11)

Constant initialization

Reference initialization

Expressions

Value categories

Order of evaluation

Operators

Operator precedence

Alternative representations

Literals

Boolean

-

Integer

-

Floating-point

Character

-

String

-

nullptr

(C++11)

User-defined

(C++11)Utilities

Attributes

(C++11)Types

typedef declaration

Type alias declaration

(C++11)Casts

Implicit conversions

static_cast

const_cast

Explicit conversions

dynamic_cast

reinterpret_cast

Memory allocation

Classes

Class declaration

Constructors

this pointer

Access specifiers

friend specifier

Class-specific function properties

Virtual function

override specifier

(C++11)

final specifier

(C++11)

explicit

(C++11)

static

Special member functions

Default constructor

Copy constructor

Move constructor

(C++11)

Copy assignment

Move assignment

(C++11)

Destructor

Templates

Class template

Function template

Template specialization

Parameter packs

(C++11)Miscellaneous

Keywords

alignas

(C++11)

alignof

(C++11)

and

and_eq

asm

auto

(*)

bitand

bitor

bool

break

case

catch

char

char8_t

(C++20)

char16_t

(C++11)

char32_t

(C++11)

class

compl

concept

(C++20)

const

consteval

(C++20)

constexpr

(C++11)

constinit

(C++20)

const_cast

continue

contract_assert

(C++26)

co_await

(C++20)

co_return

(C++20)

co_yield

(C++20)

decltype

(C++11)

default

delete

do

double

dynamic_cast

else

enum

explicit

export

extern

false

float

for

friend

goto

if

inline

int

long

mutable

namespace

new

noexcept

(C++11)

not

not_eq

nullptr

(C++11)

operator

or

or_eq

private

protected

public

register

reinterpret_cast

requires

(C++20)

return

short

signed

sizeof

(*)

static

static_assert

(C++11)

static_cast

struct

switch

template

this

thread_local

(C++11)

throw

true

try

typedef

typeid

typename

union

unsigned

using

virtual

void

volatile

wchar_t

while

xor

xor_eq

Identifiers with special meaning

final

(C++11)

override

(C++11)

import

(C++20)

module

(C++20)

post

(C++26)

pre

(C++26)

Usage

constexpr declaration specifier

See also

if statement

:

if

,

else

switch statement

:

case

,

default

(as the declaration of the default case label),

switch

goto statement

:

goto

continue statement

:

continue

break statement

:

break

return statement

:

return

,

co_return

(since C++20)

do-while loop

and

while loop

:

do

,

while

for loop

and

range-based for loop

:

for