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I've been searching and can't find anything. Consider this structure
typedef struct student
{
char name[40];
char grade;
}Student;
how do I make a macro for initializing a structure with parameters? Something along the lines of
Student John = STUDENT(John, A);
where STUDENT is a defined macro
594
When initializing a struct, the first initializer in the list initializes the first declared member (unless a designator is specified) (since C99), and all subsequent initializers without designators (since C99)initialize the struct members declared after the one initialized by the previous expression.
Initialization macros are invoked from the command line by using the --macro callExpr(args) command. This registers a callback which the compiler invokes after creating its context, but before typing the argument to --main . This then allows configuring the compiler in some ways.
An important thing to remember, at the moment you initialize even one object/ variable in the struct, all of its other variables will be initialized to default value. If you don't initialize the values in your struct, all variables will contain "garbage values".
#define STUDENT(name, grade) { #name, grade }
Then Student John = STUDENT(John, 'A'); would be expanded into
Student John = { "John", 'A' };
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