Compile time overloading

Context: Method overloading defines multiple methods with the same name but different parameters. The compiler chooses the correct one at compile time.

Example

public class Calculator
{
    public int Add(int a, int b) => a + b;
    public double Add(double a, double b) => a + b;
    public int Add(int a, int b, int c) => a + b + c;
}

Overloading Criteria

Different by:

• Number of parameters
• Type of parameters
• Order of parameters (if types differ)

void Process(int x) { }
void Process(string s) { }
void Process(int x, double y) { }
void Process(double x, int y) { } // different order

Not Allowed

• Only different return type.
• Only different parameter name.
• Only different ref/out (same underlying type).

// void M(int x) { } and int M(int x) { } // error