C++ function call template technology: parameter passing and return value generics

C function call template technology can generalize functions, including parameter passing and return values. It does this by defining template parameters using typename, allowing any number and type of parameters to be passed, and making the return value generic. This technique improves code reusability, reduces redundancy, increases flexibility, and provides type safety.

C Function Call Template Technology: Parameter Passing and Genericization of Return Values

Introduction

Function call template technology is a powerful C feature that allows you to create general functions that can operate on different data types. By using function call templates, you can avoid writing duplicate functions for each data type, simplifying your code and improving reusability.

Parameter passing

Function call templates allow you to pass any number and type of parameters in a type-safe manner. Use the template parameter keyword typename to define template parameters as follows:

template <typename T>
void my_function(T param) {
  // ...
}

In this example, T is a template parameter that represents any type of data.

Return value

Function call templates can also be used to return values ​​of generic functions. Return type template parameters are defined by using the template parameter keyword typename as follows:

template <typename T>
T my_function(T param) {
  // ...
}

In this example, T is also a return type template parameter, which represents Any data type returned by the function.

Practical case

The following is an example of a general summation function implemented using function call template technology:

template <typename T>
T sum(T a, T b) {
  return a + b;
}

This function accepts two types parameters and return their sum. Since we are using function call templates, we can use this function for different data types as follows:

int int_result = sum<int>(1, 2); //结果：3
double double_result = sum<double>(1.0, 2.5); //结果：3.5

Advantages

Using function call template technology has The following advantages:

• Improved code reusability
• Reduce redundant code
• Increased flexibility without writing specific functions for each data type
• Type safety, ensure that the parameters passed to the function and the returned value are compatible with the template parameters

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