c++14

来源： https://stackoverflow.com/questions/58603446/convert-timestamp-to-the-formatted-date-time-using-c

来源： https://stackoverflow.com/questions/58603446/convert-timestamp-to-the-formatted-date-time-using-c

来源： https://stackoverflow.com/questions/58603446/convert-timestamp-to-the-formatted-date-time-using-c

来源： https://stackoverflow.com/questions/53101121/c17-explicit-conversion-function-vs-explicit-constructor-implicit-conversio

来源： https://stackoverflow.com/questions/26089319/is-there-a-standard-definition-for-cplusplus-in-c14

来源： https://stackoverflow.com/questions/26089319/is-there-a-standard-definition-for-cplusplus-in-c14

问题 I would like to know if there is any difference the following two types of std::vector initialization in C++11 and later. std::vector<int> v1 {1, 2, 3, 4, 5}; std::vector<int> v2 = {1, 2, 3, 4, 5}; Here is a complete code example that works fine. #include <iostream> #include <vector> int main() { std::vector<int> v1 {1, 2, 3, 4, 5}; std::vector<int> v2 = {1, 2, 3, 4, 5}; std::cout << v1.size() << '\n'; std::cout << v2.size() << '\n'; } I see both initializations leading to identical results.

问题 This question already has answers here : Why do I have to access template base class members through the this pointer? (3 answers) Closed 7 months ago . I have the following code which compiles successfully in c++14. template<class T, class ...Args> class B { public: using AbcData = int; }; template<typename ...Args> class D : public B<float, Args...> { public: AbcData m_abc; }; But when compiled in c++17, it gives the following error. error C2061: syntax error: identifier 'AbcData' What is

问题 This question already has answers here : Why do I have to access template base class members through the this pointer? (3 answers) Closed 7 months ago . I have the following code which compiles successfully in c++14. template<class T, class ...Args> class B { public: using AbcData = int; }; template<typename ...Args> class D : public B<float, Args...> { public: AbcData m_abc; }; But when compiled in c++17, it gives the following error. error C2061: syntax error: identifier 'AbcData' What is

问题 I have seen code that looks like this: struct foo_functor { template <typename T, typename U> constexpr auto operator()(T t, U u) const -> decltype(t | u) { return t | u; } }; constexpr foo_functor foo; As far as I can tell, it's the same as the following: template <typename T, typename U> constexpr auto foo(T t, U u) -> decltype(t | u) { return t | u; } Why would you want to do the first one? Are there any differences? As far as I could see from the compiler output, at least with constexpr ,