Typical implementations of zip_transform_view hold two non-static data members:

either both are potentially-throwing or else neither is potentially-throwing (i.e.

either both are constant subexpressions or else neither is a constant subexpression, and.

Otherwise, no function call operator of _zip_transform_fn participates in overload resolution.Įxpression e is expression-equivalent to expression f, if meet the requirements for arguments to views::zip_transform above, _zip_transform_fn models Given a set of types Args., if std:: declval ( ). Thus, views::zip_transform can be copied freely and its copies can be used interchangeably. The effects of invoking different instances of type _zip_transform_fn on the same arguments are equivalent, regardless of whether the expression denoting the instance is an lvalue or rvalue, and is const-qualified or not (however, a volatile-qualified instance is not required to be invocable).

For exposition purposes, the cv-unqualified version of its type is denoted as _zip_transform_fn.Īll instances of _zip_transform_fn are equal.

The name views::zip_transform denotes a customization point object, which is a const function object of a literal semiregular class type. 4.1 Inherited from std::ranges::view_interface.

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