C++ Array容器的显示和隐式实例化详细介绍

//arraytp.hpp
#pragma once
template<typename T, size_t N>
class Array
{
public:
	using size_type = size_t;
	//遍历array
	void traverse() {
		for (const auto& e : arr) {
			std::cout << e << ' ';
		}
		std::cout << '\n';
	}
	T& operator[](size_type i) {
		return arr[i];
	}
private:
	T arr[N];
};

// Arrytest.cpp
#include <iostream>
#include"arraytp.hpp"
int main()
{
    //定义一个长度为9的Array数组容器
    Array<int, 9> ia;
    //给ia赋值
    for (int  i = 0; i < 9; i++)
    {
        ia[i] = i;
    }
    //遍历ia
    ia.traverse();
    return 0;
}

//arraytp.hpp
#pragma once
template<typename T, size_t N>
class Array
{
public:
	using size_type = size_t;
	void traverse();
	T& operator[](size_type i);
private:
	T arr[N];
};

//m1.cpp
#include<iostream>
#include<string>
#include "arraytp.hpp"
template<typename T,size_t N>
//遍历Array
void Array<T, N>::traverse() 
{
	for (const auto& e : arr) {
		std::cout << e << ' ';
	}
	std::cout << '\n';
}
template<typename T,size_t N>
T& Array<T, N>::operator[](size_type i) 
{
	return arr[i];
}
//在类模板中创建了三个显式类型
template class Array<int, 9>;
template class Array<double, 9>;
template class Array<std::string, 9>;

// ArryDisplay.cpp
#include <iostream>
#include"arraytp.hpp"
void assignment();
int main()
{
    assignment();
}
void assignment()
{
	//定义一个长度为9的Array数组容器
	Array<double, 9> ia;
	//给ia赋值
	for (int i = 0; i < 9; i++) {
		ia[i] = i;
	}
	//遍历
	ia.traverse();
}