std::type_order
From cppreference.com
| Defined in header <compare>
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template< class T, class U >
struct type_order;
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(since C++26) | |
Implements an implementation-defined total ordering of all types.
Provides the member constant value equal to std::strong_ordering::less if T precedes U in this implementation-defined total order, std::strong_ordering::greater if U precedes T, and std::strong_ordering::equal if they are the same type.
This ordering need not be consistent with the one induced by std::type_info::before.
The template arguments T and U can be incomplete types.
If the program adds specializations for std::type_order or std::type_order_v, the program is ill-formed.
Helper variable template
template< class T, class U >
constexpr std::strong_ordering type_order_v = type_order<T, U>::value;
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(since C++26) | |
Member constants
value [static] |
a value of type std::strong_ordering, as described above (public static member constant) |
Member functions
operator std::strong_ordering |
converts the object to std::strong_ordering, returns value (public member function) |
operator() |
returns value (public member function) |
Member types
| Type | Definition |
value_type
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std::strong_ordering
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Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_type_order |
202506L |
(C++26) | std::type_order, std::type_order_v
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Example
| This section is incomplete Reason: no example |
See also
(C++20) |
the result type of 3-way comparison that supports all 6 operators and is substitutable (class) |