[mem.res.monotonic.buffer.general] (original) (raw)

A monotonic_buffer_resource is a special-purpose memory resource intended for very fast memory allocations in situations where memory is used to build up a few objects and then is released all at once when the memory resource object is destroyed.

namespace std::pmr { class monotonic_buffer_resource : public memory_resource { memory_resource* upstream_rsrc; void* current_buffer; size_t next_buffer_size; public: explicit monotonic_buffer_resource(memory_resource* upstream); monotonic_buffer_resource(size_t initial_size, memory_resource* upstream); monotonic_buffer_resource(void* buffer, size_t buffer_size, memory_resource* upstream); monotonic_buffer_resource() : monotonic_buffer_resource(get_default_resource()) {} explicit monotonic_buffer_resource(size_t initial_size) : monotonic_buffer_resource(initial_size, get_default_resource()) {} monotonic_buffer_resource(void* buffer, size_t buffer_size) : monotonic_buffer_resource(buffer, buffer_size, get_default_resource()) {} monotonic_buffer_resource(const monotonic_buffer_resource&) = delete;virtual ~monotonic_buffer_resource(); monotonic_buffer_resource& operator=(const monotonic_buffer_resource&) = delete;void release(); memory_resource* upstream_resource() const;protected: void* do_allocate(size_t bytes, size_t alignment) override;void do_deallocate(void* p, size_t bytes, size_t alignment) override;bool do_is_equal(const memory_resource& other) const noexcept override;};}