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

检查类型是否具有ostream方法的类型特征 / Type trait to check if a type has an ostream method More...

#include <thread_logger.hpp>

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

检查类型是否具有ostream方法的类型特征 / Type trait to check if a type has an ostream method

此模板检查类型是否具有可以接受ostream引用的成员operator<<方法 / This template checks if a type has a member operator<< method that can accept an ostream reference

Template Parameters

T	要检查ostream方法的类型 / The type to check for ostream method

struct MyType {
  std::ostream& operator<<(std::ostream& os) const { return os; }
};
static_assert(has_ostream_method<MyType>::value, "MyType has ostream
method");

Member Function Documentation

test() [1/2]

template<typename T >

template<typename >

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

static

test() [2/2]

template<typename T >

template<typename U >

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

static

Member Data Documentation

value

template<typename T >

constexpr bool toolbox::logger::has_ostream_method< 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