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Standard library header <concepts>

From natekohl.net
< cpp‎ | header
 
 
 

This header is part of the concepts library.

Contents

Concepts

Core language concepts
(C++20)
specifies that a type is the same as another type
(concept) [edit]
specifies that a type is derived from another type
(concept) [edit]
specifies that a type is implicitly convertible to another type
(concept) [edit]
specifies that two types share a common reference type
(concept) [edit]
specifies that two types share a common type
(concept) [edit]
(C++20)
specifies that a type is an integral type
(concept) [edit]
specifies that a type is an integral type that is signed
(concept) [edit]
specifies that a type is an integral type that is unsigned
(concept) [edit]
specifies that a type is a floating-point type
(concept) [edit]
specifies that a type is assignable from another type
(concept) [edit]
specifies that a type can be swapped or that two types can be swapped with each other
(concept) [edit]
specifies that an object of the type can be destroyed
(concept) [edit]
specifies that a variable of the type can be constructed from or bound to a set of argument types
(concept) [edit]
specifies that an object of a type can be default constructed
(concept) [edit]
specifies that an object of a type can be move constructed
(concept) [edit]
specifies that an object of a type can be copy constructed and move constructed
(concept) [edit]
Comparison concepts
(C++20)
specifies that a type can be used in Boolean contexts
(concept) [edit]
specifies that operator == is an equivalence relation
(concept) [edit]
specifies that the comparison operators on the type yield a total order
(concept) [edit]
Object concepts
(C++20)
specifies that an object of a type can be moved and swapped
(concept) [edit]
(C++20)
specifies that an object of a type can be copied, moved, and swapped
(concept) [edit]
specifies that an object of a type can be copied, moved, swapped, and default constructed
(concept) [edit]
(C++20)
specifies that a type is regular, that is, it is both semiregular and equality_comparable
(concept) [edit]
Callable concepts
specifies that a callable type can be invoked with a given set of argument types
(concept) [edit]
(C++20)
specifies that a callable type is a Boolean predicate
(concept) [edit]
(C++20)
specifies that a callable type is a binary relation
(concept) [edit]
specifies that a relation imposes a strict weak ordering
(concept) [edit]

Customization point objects

swaps the values of two objects
(customization point object) [edit]


[edit] Synopsis

namespace std {
  // language-related concepts
  // concept same_as
  template<class T, class U>
    concept same_as = /* see description */;
 
  // concept derived_from
  template<class Derived, class Base>
    concept derived_from = /* see description */;
 
  // concept convertible_to
  template<class From, class To>
    concept convertible_to = /* see description */;
 
  // concept common_reference_with
  template<class T, class U>
    concept common_reference_with = /* see description */;
 
  // concept common_with
  template<class T, class U>
    concept common_with = /* see description */;
 
  // arithmetic concepts
  template<class T>
    concept integral = /* see description */;
  template<class T>
    concept signed_integral = /* see description */;
  template<class T>
    concept unsigned_integral = /* see description */;
  template<class T>
    concept floating_point = /* see description */;
 
  // concept assignable_from
  template<class LHS, class RHS>
    concept assignable_from = /* see description */;
 
  // concept swappable
  namespace ranges {
    inline namespace /* unspecified */ {
      inline constexpr /* unspecified */ swap = /* unspecified */;
    }
  }
  template<class T>
    concept swappable = /* see description */;
  template<class T, class U>
    concept swappable_with = /* see description */;
 
  // concept destructible
  template<class T>
    concept destructible = /* see description */;
 
  // concept constructible_from
  template<class T, class... Args>
    concept constructible_from = /* see description */;
 
  // concept default_constructible
  template<class T>
    concept default_constructible = /* see description */;
 
  // concept move_constructible
  template<class T>
    concept move_constructible = /* see description */;
 
  // concept copy_constructible
  template<class T>
    concept copy_constructible = /* see description */;
 
  // comparison concepts
  // concept boolean
  template<class B>
    concept boolean = /* see description */;
 
  // concept equality_comparable
  template<class T>
    concept equality_comparable = /* see description */;
  template<class T, class U>
    concept equality_comparable_with = /* see description */;
 
  // concept totally_ordered
  template<class T>
    concept totally_ordered = /* see description */;
  template<class T, class U>
    concept totally_ordered_with = /* see description */;
 
  // object concepts
  template<class T>
    concept movable = /* see description */;
  template<class T>
    concept copyable = /* see description */;
  template<class T>
    concept semiregular = /* see description */;
  template<class T>
    concept regular = /* see description */;
 
  // callable concepts
  // concept invocable
  template<class F, class... Args>
    concept invocable = /* see description */;
 
  // concept regular_invocable
  template<class F, class... Args>
    concept regular_invocable = /* see description */;
 
  // concept predicate
  template<class F, class... Args>
    concept predicate = /* see description */;
 
  // concept relation
  template<class R, class T, class U>
    concept relation = /* see description */;
 
  // concept strict_weak_order
  template<class R, class T, class U>
    concept strict_weak_order = /* see description */;
}

[edit] Concept same_as

template<class T, class U>
  concept __SameImpl = is_same_v<T, U>;  // exposition only
 
template<class T, class U>
  concept same_as = __SameImpl<T, U> && __SameImpl<U, T>;

[edit] Concept derived_from

template<class Derived, class Base>
  concept derived_from =
    is_base_of_v<Base, Derived> &&
    is_convertible_v<const volatile Derived*, const volatile Base*>;

[edit] Concept convertible_to

template<class From, class To>
  concept convertible_to =
    is_convertible_v<From, To> &&
    requires(From (&f)()) {
      static_cast<To>(f());
    };

[edit] Concept common_reference_with

template<class T, class U>
  concept common_reference_with =
    same_as<common_reference_t<T, U>, common_reference_t<U, T>> &&
    convertible_to<T, common_reference_t<T, U>> &&
    convertible_to<U, common_reference_t<T, U>>;

[edit] Concept common_with

template<class T, class U>
  concept common_with =
    same_as<common_type_t<T, U>, common_type_t<U, T>> &&
    requires {
      static_cast<common_type_t<T, U>>(declval<T>());
      static_cast<common_type_t<T, U>>(declval<U>());
    } &&
    common_reference_with<
      add_lvalue_reference_t<const T>,
      add_lvalue_reference_t<const U>> &&
    common_reference_with<
      add_lvalue_reference_t<common_type_t<T, U>>,
      common_reference_t<
        add_lvalue_reference_t<const T>,
        add_lvalue_reference_t<const U>>>;

[edit] Concept integral

template<class T>
  concept integral = is_integral_v<T>;

[edit] Concept signed_integral

template<class T>
  concept signed_integral = integral<T> && is_signed_v<T>;

[edit] Concept unsigned_integral

template<class T>
  concept unsigned_integral = integral<T> && !signed_integral<T>;

[edit] Concept floating_point

template<class T>
  concept floating_point = is_floating_point_v<T>;

[edit] Concept assignable_from

template<class LHS, class RHS>
  concept assignable_from =
    is_lvalue_reference_v<LHS> &&
    common_reference_with<
      const remove_reference_t<LHS>&,
      const remove_reference_t<RHS>&> &&
    requires(LHS lhs, RHS&& rhs) {
      { lhs = std::forward<RHS>(rhs) } -> same_as<LHS>;

[edit] Concept swappable

template<class T>
  concept swappable = requires(T& a, T& b) { ranges::swap(a, b); };

[edit] Concept swappable_with

template<class T, class U>
  concept swappable_with =
    common_reference_with<const remove_reference_t<T>&, const remove_reference_t<U>&> &&
    requires(T&& t, U&& u) {
      ranges::swap(std::forward<T>(t), std::forward<T>(t));
      ranges::swap(std::forward<U>(u), std::forward<U>(u));
      ranges::swap(std::forward<T>(t), std::forward<U>(u));
      ranges::swap(std::forward<U>(u), std::forward<T>(t));
    };

[edit] Concept destructible

template<class T>
  concept destructible = is_nothrow_destructible_v<T>;

[edit] Concept constructible_from

template<class T, class... Args>
  concept constructible_from = destructible<T> && is_constructible_v<T, Args...>;

[edit] Concept default_constructible

template<class T>
  concept default_constructible = constructible_from<T>;

[edit] Concept move_constructible

template<class T>
  concept move_constructible = constructible_from<T, T> && convertible_to<T, T>;

[edit] Concept copy_constructible

template<class T>
  concept copy_constructible =
    move_constructible<T> &&
    constructible_from<T, T&> && convertible_to<T&, T> &&
    constructible_from<T, const T&> && convertible_to<const T&, T> &&
    constructible_from<T, const T> && convertible_to<const T, T>;

[edit] Concept boolean

template<class B>
  concept boolean =
    movable<remove_cvref_t<B>> &&
    requires(const remove_reference_t<B>& b1,
             const remove_reference_t<B>& b2, const bool a) {
      { b1 } -> convertible_to<bool>;
      { !b1 } -> convertible_to<bool>;
      { b1 && b2 } -> same_as<bool>;
      { b1 &&  a } -> same_as<bool>;
      {  a && b2 } -> same_as<bool>;
      { b1 || b2 } -> same_as<bool>;
      { b1 ||  a } -> same_as<bool>;
      {  a || b2 } -> same_as<bool>;
      { b1 == b2 } -> convertible_to<bool>;
      { b1 ==  a } -> convertible_to<bool>;
      {  a == b2 } -> convertible_to<bool>;
      { b1 != b2 } -> convertible_to<bool>;
      { b1 !=  a } -> convertible_to<bool>;
      {  a != b2 } -> convertible_to<bool>;
    };

[edit] Concept equality_comparable

template<class T, class U>
  concept __WeaklyEqualityComparableWith = // exposition only
    requires(const remove_reference_t<T>& t,
             const remove_reference_t<U>& u) {
      { t == u } -> boolean;
      { t != u } -> boolean;
      { u == t } -> boolean;
      { u != t } -> boolean;
    };
 
template<class T>
  concept equality_comparable = __WeaklyEqualityComparableWith<T, T>;

[edit] Concept equality_comparable_with

template<class T, class U>
  concept equality_comparable_with =
    equality_comparable<T> && equality_comparable<U> &&
    common_reference_with<const remove_reference_t<T>&, const remove_reference_t<U>&> &&
    equality_comparable<
      common_reference_t<
        const remove_reference_t<T>&,
        const remove_reference_t<U>&>> &&
    __WeaklyEqualityComparableWith<T, U>;

[edit] Concept totally_ordered

template<class T>
  concept totally_ordered =
    equality_comparable<T> &&
    requires(const remove_reference_t<T>& a,
             const remove_reference_t<T>& b) {
      { a <  b } -> boolean;
      { a >  b } -> boolean;
      { a <= b } -> boolean;
      { a >= b } -> boolean;
    };

[edit] Concept totally_ordered_with

template<class T, class U>
  concept totally_ordered_with =
    totally_ordered<T> && totally_ordered<U> &&
    common_reference_with<const remove_reference_t<T>&, const remove_reference_t<U>&> &&
    totally_ordered<
      common_reference_t<
        const remove_reference_t<T>&,
        const remove_reference_t<U>&>> &&
    equality_comparable_with<T, U> &&
    requires(const remove_reference_t<T>& t,
             const remove_reference_t<U>& u) {
      { t <  u } -> boolean;
      { t >  u } -> boolean;
      { t <= u } -> boolean;
      { t >= u } -> boolean;
      { u <  t } -> boolean;
      { u >  t } -> boolean;
      { u <= t } -> boolean;
      { u >= t } -> boolean;
    };

[edit] Concept movable

template<class T>
  concept movable = is_object_v<T> && move_constructible<T> &&
                    assignable_from<T&, T> && swappable<T>;

[edit] Concept copyable

template<class T>
  concept copyable = copy_constructible<T> && movable<T> && assignable_from<T&, const T&>;

[edit] Concept semiregular

template<class T>
  concept semiregular = copyable<T> && default_constructible<T>;

[edit] Concept regular

template<class T>
  concept regular = semiregular<T> && equality_comparable<T>;

[edit] Concept invocable

template<class F, class... Args>
  concept invocable = requires(F&& f, Args&&... args) {
    invoke(std::forward<F>(f), std::forward<Args>(args)...);
      // not required to be equality-preserving
  };

[edit] Concept regular_invocable

template<class F, class... Args>
  concept regular_invocable = invocable<F, Args...>;

[edit] Concept predicate

template<class F, class... Args>
  concept predicate =
    regular_invocable<F, Args...> && boolean<invoke_result_t<F, Args...>>;

[edit] Concept relation

template<class R, class T, class U>
  concept relation =
    predicate<R, T, T> && predicate<R, U, U> &&
    predicate<R, T, U> && predicate<R, U, T>;

[edit] Concept strict_weak_order

template<class R, class T, class U>
  concept strict_weak_order = relation<R, T, U>;