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typedef struct MemoryContextMethods {
void *(*alloc) (MemoryContext context, Size size);
/* call this free_p in case someone #define's free() */ void (*free_p) (MemoryContext context, void *pointer);
void *(*realloc) (MemoryContext context, void *pointer, Size size);
void (*init) (MemoryContext context);
void (*reset) (MemoryContext context);
void (*delete) (MemoryContext context);
Size (*get_chunk_space) (MemoryContext context, void *pointer);
bool (*is_empty) (MemoryContext context);
void (*stats) (MemoryContext context);
#ifdef MEMORY_CONTEXT_CHECKING
void (*check) (MemoryContext context);
#endif
} MemoryContextMethods;
* MemoryContext * A logical context in which memory allocations occur. * * MemoryContext itself is an abstract type that can have multiple * implementations, though for now we have only AllocSetContext. * The function pointers in MemoryContextMethods define one specific * implementation of MemoryContext --- they are a virtual function table * in C++ terms. * * Node types that are actual implementations of memory contexts must * begin with the same fields as MemoryContext. * * Note: for largely historical reasons, typedef MemoryContext is a pointer * to the context struct rather than the struct type itself.
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