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};。 该结构体结合了 C 风格数组的性能、可访问性与
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]); ...
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...
下列代码用 empty 检查std::array 是否含有任何元素: 运行此代码 #include <array> #include <iostream> int main() { std::array<int, 4> numbers{3, 1, 4, 1}; std::array<int, 0> no_numbers; std::cout << std::boolalpha; std::cout << "numbers.empty(): " << numbers.empty() <<...
std::array<T,N>::begin,std::array<T,N>::cbegin C++ Containers library std::array iterator begin()noexcept; (1)(since C++11) (constexpr since C++17) const_iterator begin()constnoexcept; (2)(since C++11) (constexpr since C++17) ...
External Links−Non-ANSI/ISO Libraries−Index−std Symbol Index C reference C89,C95,C99,C11,C17,C23│Compiler supportC99,C23 Language Basic concepts Keywords Preprocessor Expressions Declaration Initialization Functions Statements Headers Type support ...
External Links−Non-ANSI/ISO Libraries−Index−std Symbol Index C reference C89,C95,C99,C11,C17,C23│Compiler supportC99,C23 Language Basic concepts Keywords Preprocessor Expressions Declaration Initialization Functions Statements Headers Type support ...
External Links−Non-ANSI/ISO Libraries−Index−std Symbol Index C reference C89,C95,C99,C11,C17,C23│Compiler supportC99,C23 Language Basic concepts Keywords Preprocessor Expressions Declaration Initialization Functions Statements Headers Type support ...
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 ; ...