"sqr is a place where one might be tempted to use a macro in C, but writing such a macro in a way that x doesn't get evaluated twice is tricky."
Slightly off-topic, but it's important to point out that in modern C, implementing such a function as a macro is always a mistake. You'd do it as an inline function.
Macros in modern C should only be used for code generation (for DRY). If the language supports doing it without a macro, then do it without a macro.
Slightly off-topic, but it's important to point out that in modern C, implementing such a function as a macro is always a mistake. You'd do it as an inline function.
Macros in modern C should only be used for code generation (for DRY). If the language supports doing it without a macro, then do it without a macro.