C++ function Lambda expression passed as parameter

C's Lambda expression can be passed as a parameter to other functions, the syntax is: auto lambda_function = [](parameter_list) -> return_type { ... }. For example, the for_each function receives as arguments a vector and a lambda expression that performs a specified operation (such as printing the vector elements to the console).

C function Lambda expression is passed as a parameter

Lambda expression is a small anonymous function that can be passed as a parameter to other functions. This is useful when one or two lines of code need to be passed as parameters.

Syntax

auto lambda_function = [](parameter_list) -> return_type {
  // lambda 函数体
};

Example

The following is an example of a C function receiving a lambda expression as a parameter:

#include <iostream>
#include <vector>

using namespace std;

void for_each(const vector<int>& v, function<void(int)> f) {
  for (int i : v) {
    f(i);
  }
}

int main() {
  vector<int> v = {1, 2, 3, 4, 5};

  // lambda 表达式作为 for_each 函数的参数
  for_each(v, [](int i) {cout << i << endl; });

  return 0;
}

Output

1
2
3
4
5

In this example, the for_each function accepts a vector and a lambda expression as parameters. A lambda expression is used as a callback function that performs a specified operation on each vector element (in this case, the output element).

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