CODEWITHSUNDEEP
c++types
Teddy
Teddy

Reputation: 1023

Destinguish between types

I have the following code:

#include <iostream>
#include <string>

typedef unsigned char type1;
typedef unsigned long type2;

type1 f(type1 value)
{
    return value * 2;
}

int main()
{
  type1 value1 = 1;
  type2 value2 = 2000;
  int int1 = f(value1);
  int int2 = f(value2);  // here I would expect that the compiler warns me that I mix type1 and type2
  std::cout << int1 << std::endl;
  std::cout << int2 << std::endl;
}

Is there a way that the compiler warns me if I mix the two types type1 (unsigned char) and type2 (unsigned long)?

Thanks Teddy

Upvotes: 2

Views: 51

Answers (1)

geza
geza

Reputation: 29962

Is there a way that the compiler warns me if I mix the two types type1 (unsigned char) and type2 (unsigned long)?

Yes, if you give -Wconversion to gcc or clang, or /W3 to MSVC, they will print a warning for your example.

(They will only warn you, if there is a potential value change. So, converting unsigned char to unsigned long generates no warning, as this conversion always retains value)

Upvotes: 2

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