_NODISCARD bool joinable() const noexcept { // return true if this thread can be joined return _Thr._Id != 0; //原生的线程id不为0,表示底层的线程己经创建 } void join() { // join thread if (!joinable()) { _Throw_Cpp_error(
if(std::is_same<typename std::decay<TYPE>::type,int>::value) { std::cout<<"int type"<<std::endl; } else { std::cout<<"other type"<<std::endl; } } 在cppref有个更加详细的例子: #include <iostream> #include <type_traits> template <typename T, typename U> struct decay_equiv ...
_NODISCARDbooljoinable()constnoexcept {//return true if this thread can be joinedreturn_Thr._Id !=0;//原生的线程id不为0,表示底层的线程己经创建}voidjoin() {//join threadif(!joinable()) { _Throw_Cpp_error(_INVALID_ARGUMENT); }if(_Thr._Id ==_Thrd_id()) { _Throw_Cpp_error(_RES...
remove_copy_if<>()remove_cv<> (C++11 起)remove_cv_t<> (C++14 起)remove_cvref<> (C++20 起)remove_cvref_t<> (C++20 起)remove_extent<> (C++11 起)remove_extent_t<> (C++14 起)remove_pointer<> (C++11 起)remove_pointer_t<> (C++14 起)remove_reference<> (C++11 起)remove_...
偶尔会使用编译选项,例如-fno-elide-constructors -std=c++14和-fno-elide-constructors,目的是禁止编译器的返回值优化RVO,C++14自身没有RVO但是编译器自作主张给它RVO了,C++17标准里纳入了RVO。 Value Category 自C++11引入的将亡值(xvalue, expiring, ex开头的字母的缩写通常是x)概念,每个人第一眼看到下图都会...
struct _Element_awaiter { remove_cvref_t<_Yielded> _Val; [[nodiscard]] constexpr bool await_ready() const noexcept { return false; } template <class _Promise> constexpr void await_suspend(coroutine_handle<_Promise> _Handle) noexcept { #ifdef __cpp_lib_is_pointer_interconvertible static_as...
问如何用copy_if实现std::remove_copy_if？EN对于C++03<functional>来说，不寻常的是，您做的工作太多...
if(_M_pi !=nullptr) _M_pi->_M_weak_add_ref; } emm,弱引用计数加1,也就是说此时_M_weak_count为1。 接着,退出作用域,此时有std::make_shared创建的对象开始释放,因此其内部的成员变量r._M_refcount也跟着释放: ~__shared_countnoexcept ...
If you only supply one, let’s call it Ref, then the reference type is Ref&& and the value type is std::remove_cvref_t<Ref>. What this means in practice is that dereferencing the generator’s iterators gives references, avoiding copies, and machinery that relies on std::ranges::range_...
templateinline typename std::remove_reference<_Tp>::type&& move(_Tp&& __t) { return static_cast::type&&>(__t); } 也就是说,其仅仅通过static_cast<>做了类型转换~ std::move仅仅将对象转换为右值引用,仅此而已 #include#includeclass Obj { ...