Home > Article > Backend Development > Things to note when passing C++ function constant reference parameters
Constant reference parameter passing ensures the invariance of parameters within the function and has the following advantages: Parameter immutability: The function cannot modify the constant reference parameters. Improved efficiency: no need to create copies of parameters. Error detection: Attempting to modify a constant reference parameter triggers a compile-time error.
Constant reference parameter passing is an effective way to achieve parameter invariance in C. By declaring the parameters as constant references, you ensure that the function does not modify the actual parameters of the call.
Constant reference parameters use the const
keyword declared between the type and parameter name:
void displayInfo(const int& value);
Use Constant reference parameter passing has the following main advantages:
The following is a simple example using constant reference parameter passing:
#include <iostream> void displayInfo(const int& value) { std::cout << "Value: " << value << std::endl; } int main() { int number = 10; displayInfo(number); // 'number' remains unchanged return 0; }
Output:
Value: 10
Notes :
When passing constant reference parameters, you need to pay attention to the following:
The above is the detailed content of Things to note when passing C++ function constant reference parameters. For more information, please follow other related articles on the PHP Chinese website!