原完整教程鏈接：6.15 An introduction to std::array
- In previous lessons, we’ve talked at length about fixed and dynamic arrays. Although both are built right into the C++ language, they both have downsides: Fixed arrays decay into pointers, losing the array length information when they do, and dynamic arrays have messy deallocation issues and are challenging to resize without error.
- To address these issues, the C++ standard library includes functionality that makes array management easier, std::array and std::vector. We’ll examine std::array in this lesson, and std::vector in the next.
Introduced in C++11, std::array provides fixed array functionality that won’t decay when passed into a function. std::array is defined in the array header, inside the std namespace.
#include <iostream>
#include <array>
void printLength(const std::array<double, 5> &myarray)
{
std::cout << "length: " << myarray.size();
}
int main()
{
std::array<double, 5> myarray { 9.0, 7.2, 5.4, 3.6, 1.8 };
printLength(myarray);
return 0;
}
