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C++ Quiz #126

Why swapValues(x, 5) Will Not Compile

mediumTemplates

swapValues(x, y) works and prints 2 1, but the program fails to compile because of swapValues(x, 5). Why?

📄 Code

1#include <iostream>
2 
3template <typename T>
4void swapValues(T& a, T& b) {
5    T temp = a;
6    a = b;
7    b = temp;
8}
9 
10int main() {
11    int x = 1;
12    int y = 2;
13    swapValues(x, y);
14    std::cout << x << " " << y << "\n";
15    swapValues(x, 5);
16    return 0;
17}