null.h

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// and just uses malloc/calloc/free.
 
#pragma once
 
#include <stdio.h>
#include <stdlib.h>
 
#include <derive-c/alloc/trait.h>
#include <derive-c/core/prelude.h>
 
DC_ZERO_SIZED(nullalloc);
 
static nullalloc NS(nullalloc, get)() { return (nullalloc){}; }
 
static void* NS(nullalloc, malloc)(nullalloc* self, size_t size) {
    (void)size;
    DC_ASSUME(self);
    return NULL;
}
 
static void* NS(nullalloc, realloc)(nullalloc* self, void* ptr, size_t size) {
    (void)size;
    DC_ASSUME(self);
    DC_ASSUME(ptr);
    return NULL;
}
 
static void* NS(nullalloc, calloc)(nullalloc* self, size_t count, size_t size) {
    (void)count;
    (void)size;
    DC_ASSUME(self);
    return NULL;
}
 
static void NS(nullalloc, free)(nullalloc* self, void* ptr) {
    (void)ptr;
    DC_ASSUME(self);
    DC_PANIC("Not possible to free memory from the null allocator, as it allocates nothing")
}
 
static void NS(nullalloc, debug)(nullalloc const* self, dc_debug_fmt fmt, FILE* stream) {
    (void)fmt;
    fprintf(stream, "nullalloc@%p { }", self);
}
 
DC_TRAIT_ALLOC(nullalloc);