C++ Macros

# define Preprocessor Directive used to create macros. There are 2 types of directives:

• Object-like Macros ← variables are better
• Function-like Macros ← ill advised use case. use normal functions instead

Object-like Macros

Without Substitution Text

#define identifier

Any further occurrence of the identifier is removed and replaced by nothing!

With subsitution Text

#define identifier substitution_text

example:

#define MY_NAME "Alex"
 
int main()
{
    std::cout << "My name is: " << MY_NAME << '\n';
 
    return 0;
}

Function Macros

I love these, but apparently theyre bad practice.

//MAKE THE MACRO. '\' are to distinguish between lines
#define process_button(b,vk)\ 
case vk: {\
input.buttons[b].is_down = is_down;\
input.buttons[b].changed = true;\
} break;
 
process_button(BUTTON_UP,VK_UP)