toolbox::logger::has_stream_operator< T > Struct Template Reference

检查类型是否具有流插入运算符(<<)的类型特征 / Type trait to check if a type has stream insertion operator (<<) More...

#include <thread_logger.hpp>

Static Public Member Functions
template<typename U >
static auto	test (int) -> std::is_same< decltype(std::declval< std::ostream & >()<< std::declval< const U & >()), std::ostream & >
template<typename >
static auto	test (...) -> std::false_type

Static Public Attributes
static constexpr bool	value = decltype(test<T>(0))::value

Detailed Description

template<typename T>
struct toolbox::logger::has_stream_operator< T >

检查类型是否具有流插入运算符(<<)的类型特征 / Type trait to check if a type has stream insertion operator (<<)

此模板检查类型是否可以使用流插入运算符插入到ostream中 / This template checks if a type can be inserted into an ostream using the stream insertion operator

Template Parameters

T	要检查流插入能力的类型 / The type to check for stream insertion capability

// 检查int是否具有流运算符 / Check if int has stream operator
static_assert(has_stream_operator<int>::value, "int has stream operator");
 
// 检查自定义类型是否具有流运算符 / Check if custom type has stream operator
struct MyType {};
static_assert(!has_stream_operator<MyType>::value, "MyType lacks stream
operator");

Member Function Documentation

test() [1/2]

template<typename T >

template<typename >

static auto toolbox::logger::has_stream_operator< T >::test (   ... ) -> std::false_type

static

test() [2/2]

template<typename T >

template<typename U >

static auto toolbox::logger::has_stream_operator< T >::test ( int  ) -> std::is_same< decltype(std::declval< std::ostream & >()<< std::declval< const U & >()), std::ostream & >

static

Member Data Documentation

value

template<typename T >

constexpr bool toolbox::logger::has_stream_operator< T >::value = decltype(test<T>(0))::value

staticconstexpr

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

• src/include/cpp-toolbox/logger/thread_logger.hpp