std::experimental::ranges::ConvertibleTo

Defined in header <experimental/ranges/concepts>
template < class From, class To > concept bool ConvertibleTo = std::is_convertible <From, To> :: value &&     requires(From ( &f) ( ) ) { static_cast <To> (f( ) ) ; } ;		(ranges TS)

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

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()

• Either
  • To is neither an object type nor a reference-to-object type, or
  • static_cast<To>(f()) is equal to test(f)

• One of the following is true:
  • From is not a reference-to-object type, or
  • From is an rvalue reference to a non-const-qualified type, and the resulting state of the object referenced by f()
  • the object referred to by f() is not modified by either expression above.

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

Unless noted otherwise, every expression used in a requires-expression

See also

is_convertibleis_nothrow_convertible (C++11)(C++20)

checks if a type can be converted to the other type (class template)