C++ template overload

運行結果：

may be you are right
may be you are right
9 7 6 5 4 3 2 1 10 66 
9 7 6 5 4 3 2 1 10 66 
Program ended with exit code: 0

Test.cpp

#include <iostream>

using namespace std;

template <typename T>
void show(T a, size_t);

template <typename T>
void show(T a);

int main() {
    int a[] = {9, 7, 6, 5, 4, 3, 2, 1, 10,66};
    int b[sizeof(a) / sizeof(int)] = {};  // 建立同數組a相同大小的數組b並將其所有元素初始化爲0

    char aa[] = "may be you are right";
    char bb[strlen(aa) + 1]; // 多分配一個字節存儲截止符'\0'

    memcpy(bb, aa, strlen(aa) + 1);
    memcpy(b, a, sizeof(a));  // 因爲memcpy是逐字節拷貝，而數組b爲int類型，拷貝的長度應爲sizeof(a)

    show(a, sizeof(a) / sizeof(int));
    show(b, sizeof(b) / sizeof(int));
    show(aa);
    show(bb);

    return 0;
}

template<typename T>
void show(T a, size_t len) {
    for (int i = 0; i < len; i++)
        cout << a[i] << ' ';
    cout << endl;
}

template<typename T>
void show(T a) {
    while ((*a) != '\0')
        cout << *a++;
    cout << endl;
}