std::experimental::ranges::ConvertibleTo (3) - Linux Manuals
std::experimental::ranges::ConvertibleTo: std::experimental::ranges::ConvertibleTo
NAME
std::experimental::ranges::ConvertibleTo - std::experimental::ranges::ConvertibleTo
Synopsis
Defined in header <experimental/ranges/concepts>
template <class From, class To>
concept bool ConvertibleTo =
std::is_convertible<From, To>::value && (ranges TS)
requires(From (&f)()) {
static_cast<To>(f());
};
The concept ConvertibleTo<From, To> specifies that an expression of the type and value category specified by From can be implicitly and explicitly converted to the type To, and the two forms of conversion are equivalent.
Specifically, ConvertibleTo<From, To> is satisfied only if, given the invented function To test(From (&f)()) { return f(); } and a function f of type From () such that the expression f() is equality-preserving (see below),
* Either
* One of the following is true:
There need not be any subsumption relationship between ConvertibleTo<From, To> and std::is_convertible<From, To>::value.
Equality preservation
An expression is equality preserving if it results in equal outputs given equal inputs.
* The inputs to an expression consist of its operands.
* The outputs of an expression consist of its result and all operands modified by the expression (if any).
Every expression required to be equality preserving is further required to be stable: two evaluations of such an expression with the same input objects must have equal outputs absent any explicit intervening modification of those input objects.
Unless noted otherwise, every expression used in a requires-expression is required to be equality preserving and stable, and the evaluation of the expression may only modify its non-constant operands. Operands that are constant must not be modified.
See also
is_convertible
is_nothrow_convertible checks if a type can be converted to the other type
(C++11)
(C++20)