C FFI¶

Q++ compiles to C, so calling C is straightforward.

extern craft¶

Declare C functions:

extern craft fopen(path: str, mode: str) -> link void;
extern craft fclose(stream: link void) -> i32;
extern craft malloc(size: usize) -> link void;
extern craft free(ptr: link void) -> void;

Calling Conventions¶

str maps to char*
link T maps to T*
Structs are passed by value; use link StructName for pointers
Return types follow C ABI

Passing Structs¶

form Point { x: i32, y: i32 }

extern craft c_use_point(p: link Point) -> void;

craft main() -> void {
    make shift pt: Point = ...;
    c_use_point(mark pt);
    send;
}

Common C Types¶

Q++	C
`i32`	`int32_t`
`u64`	`uint64_t`
`str`	`char*`
`link void`	`void*`