gpointer (*realloc) (gpointer mem, gsize n_bytes);
void (*free) (gpointer mem);
gpointer (*calloc) (gsize n_blocks, gsize n_block_bytes);
gpointer (*realloc) (gpointer mem, gsize n_bytes);
void (*free) (gpointer mem);
gpointer (*calloc) (gsize n_blocks, gsize n_block_bytes);