traits

Definition

Contains traits definitions.

Classes
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<<). More...
struct	xtd::is_stream_insertable< value_t, std::void_t< decltype(std::declval< std::ostream & >()<< std::declval< const std::remove_cvref_t< value_t > & >()) > >
	Specialization of is_stream_insertable for types that support stream insertion into std::ostream. More...
struct	xtd::is_stream_insertable< value_t >
	Specialization of is_stream_insertable for types that support stream insertion into std::ostream. More...

Variables
template<class value_t>
constexpr bool	xtd::is_stream_insertable_v
	Convenience variable template equivalent to is_stream_insertable_v<value_t>::value.

Variable Documentation

is_stream_insertable_v

template<class value_t>

bool xtd::is_stream_insertable_v

inlineconstexpr

#include <xtd.core/include/xtd/is_stream_insertable.hpp>

Convenience variable template equivalent to is_stream_insertable_v<value_t>::value.

Definition

template<class value_t>
inline constexpr bool is_stream_insertable_v = is_stream_insertable<std::remove_cvref_t<value_t>>::value;

Header

#include <xtd/is_stream_insertable>

Namespace

xtd

Library

xtd.core

This helper allows simpler and more readable usage, especially in if constexpr expressions and static assertions.

Template Parameters

value_t

The type to test for stream insertability. static_assert(xtd::is_stream_insertable_v<int>); static_assert(!xtd::is_stream_insertable_v<std::vector<int>>);

See also

is_stream_insertable