How to use class templates in C++ function templates?

#C Class templates in function templates

C Function templates are aware of class templates and utilize them as parameter types. This allows you to create generic functions that work with a variety of data types and structures.

Syntax

template<typename T>
void func(const T& arg1, const T2& arg2, ...);

Where:

• T is the type template of the function parameter.
• arg1, arg2 and subsequent parameters are the actual parameters of the function.

Practical Case

Consider a function that prints a pair of values ​​of any type:

template <typename T1, typename T2>
void print_pair(const T1& a, const T2& b) {
  std::cout << a << " " << b << std::endl;
}

We can apply this function template to Different type combinations:

int main() {
  print_pair(1, 2.5);  // 打印整数和浮点数
  print_pair("Hello", "World");  // 打印字符串
  return 0;
}

In the first example, T1 is deduced to int and T2 is deduced to double. In the second example, both T1 and T2 are deduced to std::string.

Advantages

Function templates using class templates have the following advantages:

• Code reusability:No need to Write multiple functions for each data type.
• Universality: The function can be applied to any data type that meets the requirements of the type template.
• Enhanced code readability: Reduces duplicate code and improves code readability and maintainability.

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