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C/C++ specifier referring to constant expression
constexpr is a specifier keyword in the C and C++ programming languages which, roughly speaking, specifies that something may be evaluated at compile
Constexpr
2011 edition of the C++ programming language standard
type if they are defined with the constexpr keyword: constexpr double EARTH_GRAVITATIONAL_ACCELERATION = 9.8; constexpr double MOON_GRAVITATIONAL_ACCELERATION
C++11
Revision of the C++ programming language released in 2026
comparisons constexpr structured bindings and references to constexpr variables constexpr placement new constexpr cast from void* constexpr containers
C++26
C programming language standard, current revision
(see "types" group). Add nullptr keyword (see "constants" group). Add constexpr keyword (see "other" group). Add _Decimal32, _Decimal64, _Decimal128 keywords
C23_(C_standard_revision)
2023 edition of the C++ programming language standard
expressions attributes on lambda expressions constexpr changes: non-literal variables, labels, and gotos in constexpr functions allowing static and thread_local
C++23
Memory allocation scheme
~Arena() = default; constexpr Arena(Arena&&) noexcept = default; constexpr Arena& operator=(Arena&&) noexcept = default; constexpr Arena(const Arena&)
Region-based memory management
Region-based_memory_management
Handling of signals in the C programming language
sig; public: static constexpr int ABRT = SIGABRT; static constexpr int FPE = SIGFPE; static constexpr int ILL = SIGILL; static constexpr int INT = SIGINT;
C_signal_handling
2020 edition of the C++ programming language standard
the explicit modifier to be contingent on a Boolean expression expanded constexpr: virtual functions, union, try and catch, dynamic_cast and typeid, std::pointer_traits
C++20
Metaprogramming technique
Factorial { static constexpr uint32_t VALUE = N * Factorial<N - 1>::VALUE; }; template <> struct Factorial<0> { static constexpr uint32_t VALUE = 1;
Template_metaprogramming
Variable defined in a class whose objects all possess the same copy
WHITE; }; inline constexpr Color Color::BLACK = Color(0, 0, 0); inline constexpr Color Color::RED = Color(255, 0, 0); inline constexpr Color Color::GREEN
Class_variable
2014 edition of the C++ programming language standard
calls to any non-const constexpr-declared non-static member functions. goto statements are forbidden in C++14 relaxed constexpr-declared functions. Also
C++14
Program function without side effects
of some other constraints. Examples include constexpr of C++ (both properties). See also: C++11 § constexpr – Generalized constant expressions. Since pure
Pure_function
Feature of some compilers
using constexpr. import std; constexpr unsigned int factorial(unsigned int n) noexcept { return n ? (n * factorial(n - 1)) : 1; } constexpr unsigned
Compile-time function execution
Compile-time_function_execution
General-purpose programming language
_Thread_local ‡ C23 reserved fifteen more words: alignas alignof bool constexpr false nullptr static_assert thread_local true typeof typeof_unqual _BitInt
C_(programming_language)
Feature in the C++ programming language
template could be defined like this: template <typename T> [[nodiscard]] constexpr T& max(const T& a, const T& b) noexcept { return a < b ? b : a; } This
Template_(C++)
Form of text that defines C code
of which there are 43. alignas alignof auto bool break case char const constexpr continue default do double else enum extern float for goto if inline int
C_syntax
Class in object-oriented programming languages
noexcept { const Host& self = static_cast<const Host&>(*this); template for (constexpr info m: std::meta::nonstatic_data_members_of(^^Host)) { if (!(self.[:m:]
Mixin
Type of data structure
U> void operator()(U&& v) { if constexpr (is_same_v<U, Leaf<T>&>) { std::println("{}", v.getValue()); } else if constexpr (is_same_v<U, Node<T>&>) { if
Tagged_union
Container for a set of identifiers
std::println; namespace box1 { constexpr int BOX_SIDE = 4; } namespace box2 { constexpr int BOX_SIDE = 12; } int main() { constexpr int BOX_SIDE = 42; println("{}"
Namespace
Value that is not changed during execution
C++, macros provide the former, while const/constexpr provides the latter: #define PI 3.1415926535 constexpr double PI = 3.1415926535; // compile-time constant
Constant (computer programming)
Constant_(computer_programming)
Ability of a process to examine and modify itself
^^findMethod); } template <info T, const char* Name> constexpr auto createInvokerImpl = []() -> auto { static constexpr info M = findMethod(T, Name); contract_assert(
Reflective_programming
Templates in computer programming
<typename... Ts> requires (sizeof...(Ts) > 0) constexpr auto reversed(Ts&&... args) noexcept { constexpr size_t MAX_INDEX_SIZE = sizeof...(args) - 1; auto
Variadic_template
Problem used to illustrate synchronization issues and techniques for resolving them
#include <mutex> #include <random> #include <semaphore> #include <thread> constexpr const size_t N = 5; // number of philosophers (and forks) enum class State
Dining_philosophers_problem
Programming language
CaseLabels} ":" StatementSeq]. CaseLabels = ConstExpr [".." ConstExpr]. Guard = Qualident ":" Qualident. ConstExpr = Expr. Expr = SimpleExpr [Relation SimpleExpr]
Component_Pascal
Programming paradigm based on applying and composing functions
optimizations. Fortran 95 also lets functions be designated pure. C++11 added constexpr keyword with similar semantics. Iteration (looping) in functional languages
Functional_programming
Danish computer scientist, creator of C++ (born 1950)
programming: template metaprogramming and compile-time evaluated functions ("constexpr functions"). Direct use of machine and operating system resources. Concurrency
Bjarne_Stroustrup
Style of computer programming
max() could be defined like this: template <typename T> [[nodiscard]] constexpr T max(T x, T y) noexcept { return x < y ? y : x; } Specializations of
Generic_programming
Type qualifier denoting the data as being read-only
traditional runtime constant constexpr, a constant or expression which can be evaluated at compile time (see constexpr) consteval, which declares that
Const_(computer_programming)
Class of algorithms
the original (PDF) on February 13, 2015. Retrieved January 2, 2016. "constexpr tree structures". Fekir's Blog. 9 August 2021. Retrieved 2021-08-15. Morris
Tree_traversal
Cross-platform build tool for configuring platform-specific builds
std::println("Hello, world!"); } return 0; } hello.hpp: #pragma once constexpr int TIMES = 10; CMakeLists.txt: cmake_minimum_required(VERSION 3.22) project(HelloWorld
CMake
Type that allows only one value
unit type; the above example becomes compilable as: class UnitType {}; constexpr UnitType UNIT; UnitType f(UnitType) noexcept { return UNIT; } UnitType
Unit_type
Tool of editors for programming, scripting, and markup
highlighted C++ code: import std; using std::array; using std::shared_ptr; constexpr size_t MAX_WINDOW_COUNT = 100; // Create Window objects and store them
Syntax_highlighting
Statistical transform
std::pair<double, double> generateGaussianNoise(double mu, double sigma) { constexpr double two_pi = 2.0 * M_PI; //initialize the random uniform number generator
Box–Muller_transform
Game programming library
namespace raylib::Colors; int main(int argc, char* argv[]) { constexpr int SCREEN_WIDTH = 800; constexpr int SCREEN_HEIGHT = 450; Window window(SCREEN_WIDTH,
Raylib
Polynomial-time algorithm for the assignment problem
perform the check on * @return true if b < a */ template <typename T> constexpr bool ckmin(T& a, const T& b) { return b < a ? a = b, true : false; } /**
Hungarian_algorithm
C++ syntax for specifying placement of objects in memory
ptr = nullptr; } } public: constexpr Box() = default; constexpr ~Box() { destroy(); } template <typename... Args> constexpr T& emplace(Args&&... args)
Placement_syntax
Programming language
CaseLabels} ":" StatementSeq]. CaseLabels = ConstExpr [".." ConstExpr]. Guard = Qualident ":" Qualident. ConstExpr = Expr. Expr = SimpleExpr [Relation SimpleExpr]
Oberon-2
Sequence of bits or bytes of a fixed size
using std::array; using std::byte; using std::ifstream; using std::ios; constexpr size_t BLOCK_SIZE = 4096; try { ifstream file("example.bin", ios::binary);
Block_(data_storage)
C standard library header file
routines GCE-Math is a version of C/C++ math functions written for C++ constexpr (compile-time calculation) CORE-MATH, correctly rounded for single and
C_mathematical_functions
C++ template metaprogramming technique
import std; template <typename E> class VecExpression { public: static constexpr bool IS_LEAF = false; [[nodiscard]] double operator[](size_t i) const
Expression_templates
Description of ownership of identifiers across translation units
} // constexpr implicitly grants internal linkage constexpr size_t MAX_ATTEMPTS = 3; // inline constexpr grants external linkage inline constexpr size_t
Linkage_(software)
C++ programming technique
first overload worked and T has a nested type named // Foobar. static constexpr bool value = (sizeof(test<T>(nullptr)) == sizeof(Yes)); }; struct Foo
Substitution failure is not an error
Substitution_failure_is_not_an_error
Method of calculating ray-triangle intersections in 3D space
vec3 &ray_origin, const vec3 &ray_vector, const triangle3& triangle) { constexpr float epsilon = std::numeric_limits<float>::epsilon(); vec3 edge1 = triangle
Möller–Trumbore intersection algorithm
Möller–Trumbore_intersection_algorithm
Technique circumventing programming language data typing
function be labeled constexpr. The reference implementation is a wrapper around std::memcpy. import std; using std::numeric_limits; constexpr bool is_negative(float
Type_punning
2017 edition of the C++ programming language standard
expressions, for variadic templates A compile-time static if with the form if constexpr (expression) Structured binding declarations, allowing auto [a, b] =
C++17
Performance-degrading usage pattern
std::vector<std::jthread> threads; const int hc = std::jthread::hardware_concurrency(); constexpr int testLimit = 256; // for simplicity up most that many elements for
False_sharing
Universal code encoding positive integers
representation of 10^10000) #include <vector> template <class Integer> constexpr std::vector<bool> little_endian_binary(Integer num){ std::vector<bool>
Elias_omega_coding
Sequence of program instructions invokable by other software
87. Retrieved 25 December 2023. Microsoft Learn (22 February 2023). "constexpr (C++)". learn.microsoft.com. Microsoft Learn. "Small Basic". Small Basic
Function (computer programming)
Function_(computer_programming)
Programming language operator
struct User { string name; int age; }; int main() { constexpr info stringClass = ^^string; constexpr User john { .name = "John Doe", .age = 20 }; std::println("The
Typeof
using std::totally_ordered; template <totally_ordered T> [[nodiscard]] constexpr T min(T a, T b) noexcept { return (b < a) ? b : a; } Or, instead of the
Concept_(generic_programming)
Loop transformation technique
that this number is a 'constant constant' reflecting the code below. constexpr int BUNCHSIZE = 8 int main(void) { int i = 0; // counter int entries =
Loop_unrolling
const std::size_t value = 1 + rank<T>::value; }; template <typename T> constexpr auto rank_v = rank<T>::value; /* Rank of an expression * * Let the rank
Rank_(computer_programming)
Set of rules defining correctly structured C++ program
case catch char char8_t char16_t char32_t class concept const consteval constexpr constinit const_cast continue contract_assert co_await co_return co_yield
C++_syntax
Type system in computer science
concept EqualityComparable: template <EqualityComparable T> [[nodiscard]] constexpr bool isEqual(const T& x, const T& y) noexcept { return x == y; } In Go
Type_class
Feature of programming languages
keywords await/async with macros. #include <stdio.h> #include "s_task.h" constexpr int STACK_SIZE = 64 * 1024 / sizeof(int); // define stack memory for tasks
Async/await
Text processor used with C and C++ and other programming tools
consuming runtime memory. A newer language construct (since C++11 and C23), constexpr allows for declaring a compile-time constant value that need not consume
C_preprocessor
C++ programming keywords for dynamic memory allocation
using the wrong form. The C++11 standard specifies an additional syntax, constexpr size_t N = /* some length */; T* p = new T[N] {initializer1, ..., initializerN};
New_and_delete_(C++)
Compiler optimization to remove code which does not affect the program results
preprocessor. Consider the following code. // set DEBUG_MODE to false constexpr bool DEBUG_MODE = false; int main(void) { int a = 5; int b = 6; int c;
Dead-code_elimination
Encapsulation of an optional value in programming or type theory
T> optional<T>. import std; using std::nullopt; using std::optional; constexpr optional<double> divide(double x, double y) noexcept { if (y != 0.0) {
Option_type
Named set of data type values
because C lacks namespacing features. Prior to the introduction of the constexpr keyword in C23, enums were often used to declare compile-time constants
Enumerated_type
2025[update] and C23, there are five type qualifiers in standard C: const (C89), constexpr (C23), volatile (C89), restrict (C99) and _Atomic (C11) – the latter has
Type_qualifier
Unused program code
FnCall& fn) { // List of chars we must convert to escape sequences static constexpr string_view hexDigits = "0123456789ABCDEF"; string input = fn.arg(0).to_string();
Oxbow_code
Programming language
as ISO/IEC 14882:2017, it added features like structured bindings, if constexpr, and parallel algorithms. Replaced C++14. C++20 — Released in December
Outline of the C++ programming language
Outline_of_the_C++_programming_language
Group of standard library class templates
greater than 4 numbers.erase( std::ranges::remove_if( numbers, [](int n) constexpr -> bool { return n > 4; } ), numbers.end() ); // print all the remaining
Sequence_container_(C++)
of template argument deduction. Since C++17, a lambda can be declared constexpr, and since C++20, consteval with the usual semantics. These specifiers
Examples of anonymous functions
Examples_of_anonymous_functions
CONSTEXPR
CONSTEXPR
CONSTEXPR
CONSTEXPR
Girl/Female
Irish
“beautiful, radiant, joyful.†Known as the greatest woman warrior in the world, Aoife was the mother of Cuchulainn’s (read the legend) only son, Connlach. Aoife Dearg (“Red Aoifeâ€) was a daughter of a king of Connacht who had her marriage arranged by St. Patrick himself. In 2003 Aoife was the third most popular Irish girls name for babies in Ireland.
Boy/Male
Indian, Punjabi, Sikh
Protector of Earth
Girl/Female
Hindu
The powerful mind beloved
Surname or Lastname
English
English : unexplained. In the U.S., this is a predominantly a southern name, with large concentrations in NC, SC, and GA.
Girl/Female
Tamil
Devashree | தேவாஷà¯à®°à¯€
Goddess Lakshmi, Divine beauty
Girl/Female
Australian, German
Magnificent; From the High Tower
Boy/Male
Arabic
Raza
Male
English
Anglicized form of Chinese Kong Fu Zi. Kong is the surname, CONFUCIUS means "hole" or "opening." Fu is the generation name, meaning "husband, master, man," and Zi is the given name, meaning "son."
Boy/Male
Hindu
Bright straight forward person
Girl/Female
Hebrew
Gives joy.
CONSTEXPR
CONSTEXPR
CONSTEXPR
CONSTEXPR
CONSTEXPR