std::array是封装固定大小数组的容器。 此容器是一个聚合类型,其语义等同于保有一个C 风格数组T[N]作为其唯一非静态数据成员的结构体。不同于 C 风格数组,它不会自动退化成T*。作为聚合类型,它能聚合初始化,只要有至多N个能转换成T的初始化器:std::array<int,3>a={1,2,3};。
以下示例应塞入代码段内: #include <algorithm>#include <array>#include <iostream>#include <iterator>#include <string>int main(){#include <algorithm>#include <array>#include <iostream>#include <iterator>#include <string>int main(){// construction uses aggregate initializationstd::array<int, 3> a...
std::array Defined in header<array> template<classT,std::size_tN> constexprstd::array<std::remove_cv_t<T>, N>to_array(T(&a)[N]); (1)(since C++20) template<classT,std::size_tN> constexprstd::array<std::remove_cv_t<T>, N>to_array(T(&&a)[N]); ...
std::is_array 是一元类型特征 (UnaryTypeTrait) 。 检查T 是否数组类型。如果 T 为数组类型,那么提供的成员常量 value 等于true。否则 value 等于false。 如果程序添加了 std::is_array 或std::is_array_v 的特化,那么行为未定义。 模板形参T - 要检查的类型 ...
std::array<T,N>::operator[] From cppreference.com std::array Member types Member functions Element access array::at array::operator[] array::front array::back array::data Iterators array::beginarray::cbegin array::endarray::cend array::rbeginarray::crbegin ...
are stored contiguously, which means that elements can be accessed not only through iterators, but also using offsets to regular pointers to elements. This means that a pointer to an element of a vector may be passed to any function that expects a pointer to an element of an array. ...
char* strncpy( char* dest, const char* src, std::size_t count ); Copies at most count characters of the byte string pointed to by src (including the terminating null character) to character array pointed to by dest. If count is reached before the entire string src was copied, the ...
a function call or an overloaded operator expression of rvalue reference to object return type, such as std::move(x); (注意:返回右值引用的表达式(方法和运算符重载),是消亡值,而不是纯右值) a[n], the built-in subscript expression, where one operand is an array rvalue ; ...
7 { 8 int label; 9 float score; 10 }; 11 12 13 int bbox_init(std::vector<...
array(C++11)−vector map−unordered_map(C++11) priority_queue−span(C++20) Autres conteneurs: sequence−associative unordered associative−adaptors Itérateurs Plages d'éléments(C++20) Algorithmes Bibliothèque numérique Fonctions mathématiques communes ...