template<class T> struct is_array : std::false_type {}; template<class T> struct is_array<T[]> : std::true_type {}; template<class T, std::size_t N> struct is_array<T[N]> : std::true_type {}; Example Run this c
std::swap(std::array) (C++11) 特化std::swap算法 (函数模板) to_array (C++20) 从内建数组创建std::array对象 (函数模板) get(std::array) (C++11) 访问array的一个元素 (函数模板) 范围访问 begincbegin (C++11)(C++14) 返回指向容器或数组起始的迭代器 ...
vector−deque−array(C++11) list−forward_list(C++11) inplace_vector(C++26) hive(C++26) map−multimap−set−multiset unordered_map(C++11) unordered_multimap(C++11) unordered_set(C++11) unordered_multiset(C++11) Container adaptors ...
Array is a type consisting of a contiguously allocated nonempty sequence of objects with a particularelement type. The number of those objects (the array size) never changes during the array lifetime. Syntax In thedeclaration grammarof an array declaration, thetype-specifiersequence designates theel...
template<class T> struct is_object : std::integral_constant<bool, std::is_scalar<T>::value || std::is_array<T>::value || std::is_union<T>::value || std::is_class<T>::value> {};ExampleRun this code #include <iomanip> #include <iostream> #include <type_traits> #define IS_...
cout << "j is " << j << " and k is " << k << endl; } for( ; ; ) { // loop forever! } do,while friend goto labelA; ... labelA: 考虑有害性,所以它不经常使用. 例如, goto可以用来跳出多重嵌套for循环,它比额外的逻辑性跳出更具有时效性. ...
(),std::ostream_iterator<int>(std::cout, " "));std::cout << '\n';// ranged for loop is supportedfor (const auto& s: a3)std::cout << s << ' ';// deduction guide for array creation (since C++17)[[maybe_unused]] std::array a4{3.0, 1.0, 4.0}; // -> std::array<...
1) 广义左值可能被隐式地[implicitly]转换为纯右值。这是因为有左值到右值,数组到指针,函数到指针的隐式转换。[a glvalue may be implicitly converted to a prvalue with lvalue-to-rvalue, array-to-pointer, or functon-to-pointer implicit conversion.] ...
A prvalue cannot be polymorphic: the dynamic type of the object it identifies is always the type of the expression. (纯右值不能是动态类型) A non-class non-array prvalue cannot be cv-qualified. (不是class也不是数组的纯右值不能声明为const, volatile, const-volatile) ...
#include <iostream> #include <type_traits> class A {}; int main() { std::cout << std::boolalpha; std::cout << std::is_array<A>::value << '\n'; std::cout << std::is_array<A[3]>::value << '\n'; std::cout << std::is_array<float>::value << '\n'; std::cout...