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Alias the function you want to override to a weakly-defined function, and then reimplement it yourself. override.h. #define foo(x) __attribute__((weak))foo(x) foo.c. function foo() { return 1234; } override.c. function foo() { return 5678; } Use pattern-specific variable values in your Makefile to add the compiler flag -include override.h.
I can, in my calling C++ code, simply override the behaviour of exit with. extern "C" void exit(int status) {. throw 1; } exit is an identifier reserved by the C standard library, and void exit(int) is a function signature reserved by thexitWithErrore C++ standard library.
How do I call a C++ function from C? Just declare the C++ function extern "C" (in your C++ code) and call it (from your C or C++ code). For example: // C++ code: extern "C" void f(int); void f(int i) { // ... } Now f() can be used like this:
3 days ago · A function declaration introduces the function name and its type. A function definition associates the function name/type with the function body.
4 days ago · A function definition associates the function body (a sequence of declarations and statements) with the function name and parameter list. Unlike function declaration, function definitions are allowed at file scope only (there are no nested functions). C supports two different forms of function definitions:
Aug 2, 2021 · Syntax. #define identifier token-stringopt. #define identifier ( identifieropt, ... , identifieropt ) token-stringopt. Remarks. The #define directive causes the compiler to substitute token-string for each occurrence of identifier in the source file. The identifier is replaced only when it forms a token.
Jul 14, 2023 · In C programming, #define is a preprocessor directive that is used to define macros. The macros are the identifiers defined by #define which are replaced by their value before compilation. We can define constants and functions like macros using #define.