std::experimental::ranges::difference_type
From cppreference.com
| Defined in header <experimental/ranges/iterator>
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template< class I >
struct difference_type {};
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(1) | |
template< class T >
struct difference_type<T*>;
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(2) | |
template< class T >
struct difference_type<const T> : difference_type<std::decay_t<T>> {};
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(3) | |
template< class T >
requires requires { typename T::difference_type; }
struct difference_type<T>;
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(4) | |
template< class T >
requires !requires { typename T::difference_type; } &&
requires(const T& a, const T& b) { {a - b} -> Integral; }
struct difference_type<T>;
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(5) | |
Computes the associated difference type of the type I, if any. Users may specialize difference_type for a program-defined type.
1) Primary template is an empty struct.
2) Specialization for pointers. If
T is an object type, provides a member type type equal to std::ptrdiff_t. Otherwise, there is no member type.3) Specialization for const-qualified types.
4) Specialization for types that define a public and accessible member type
difference_type. Provides a member type type equal to T::difference_type. 5) Specialization for types that do not define a public and accessible member type
difference_type but do support subtraction. Provides a member type type equal to std::make_signed_t<decltype(std::declval<T>() - std::declval<T>())>.Helper alias template
template< class T >
using difference_type_t = typename ranges::difference_type<T>::type;
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(ranges TS) | |
Example
| This section is incomplete Reason: no example |