How to pass generic parameters in C++ generic function?

Passing generic parameters to a generic function in C++: Declare a generic function: Use the template keyword and the type placeholder T. Calling a function with generic arguments: Replace type placeholders with concrete type arguments.

Passing generic parameters in C++ generic functions

Generic functions allow you to write code that operates on different data types without having to specify Write separate functions for data types. In C++, generic parameters are represented using the type placeholder T.

To pass generic parameters to a generic function, follow these steps:

1. Declare a generic function: Use template Key Word and type placeholders to declare generic functions. For example:

template<typename T>
T max(T a, T b) {
  return (a > b) ? a : b;
}

2. Call a function using generic parameters: Call a generic function by replacing the type placeholder with a specific type argument. For example:

int x = max<int>(1, 2);  // 调用 max<int>，返回 int
double y = max<double>(3.14, 2.71);  // 调用 max<double>，返回 double

Practical case

Objective: Write a generic function to print different types of values.

Code:

#include <iostream>

template<typename T>
void print(T value) {
  std::cout << value << std::endl;
}

int main() {
  print<int>(5);  // 打印整数
  print<double>(3.14);  // 打印浮点数
  print<std::string>("Hello");  // 打印字符串
  return 0;
}

Output:

5
3.14
Hello

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