xtd::is_stream_insertable< value_t, class > Struct Template Reference

Inheritance diagram for xtd::is_stream_insertable< value_t, class >:

Definition

template<class value_t, class = void>
struct xtd::is_stream_insertable< value_t, class >

Type trait that determines whether a type can be inserted into an std::ostream using the stream insertion operator (operator<<).

Definition

template<class value_t>
struct is_stream_insertable<value_t, std::void_t<decltype(std::declval<std::ostream&>() << std::declval<const value_t&>())>> : std::true_type {};

Header

#include <xtd/is_stream_insertable>

Namespace

xtd

Library

xtd.core

This trait evaluates to std::true_type if the following expression is valid:

std::declval<std::ostream&>() << std::declval<const value_t&>()

Otherwise, it evaluates to std::false_type.

Template Parameters

value_t

The type to test for stream insertability.

Note

This trait only checks syntactic validity of the insertion expression. It does not guarantee any particular semantic meaning or formatting quality of the output.

See also

is_stream_insertable_v

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The documentation for this struct was generated from the following file:

• xtd.core/include/xtd/is_stream_insertable.hpp