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libstdc++
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Public Member Functions | |
| monotonic_buffer_resource (const monotonic_buffer_resource &)=delete | |
| monotonic_buffer_resource (memory_resource *__upstream) noexcept | |
| monotonic_buffer_resource (size_t __initial_size) noexcept | |
| monotonic_buffer_resource (size_t __initial_size, memory_resource *__upstream) noexcept | |
| monotonic_buffer_resource (void *__buffer, size_t __buffer_size) noexcept | |
| monotonic_buffer_resource (void *__buffer, size_t __buffer_size, memory_resource *__upstream) noexcept | |
| void * | allocate (size_t __bytes, size_t __alignment=_S_max_align) |
| void | deallocate (void *__p, size_t __bytes, size_t __alignment=_S_max_align) |
| bool | is_equal (const memory_resource &__other) const noexcept |
| monotonic_buffer_resource & | operator= (const monotonic_buffer_resource &)=delete |
| void | release () noexcept |
| memory_resource * | upstream_resource () const noexcept |
Protected Member Functions | |
| void * | do_allocate (size_t __bytes, size_t __alignment) override |
| void | do_deallocate (void *, size_t, size_t) override |
| bool | do_is_equal (const memory_resource &__other) const noexcept override |
A memory resource that allocates from a fixed-size buffer.
The main feature of a pmr::monotonic_buffer_resource is that its do_deallocate does nothing. This makes it very fast because there is no need to manage a free list, and every allocation simply returns a new block of memory, rather than searching for a suitably-sized free block. Because deallocating is a no-op, the amount of memory used by the resource only grows until release() (or the destructor) is called to return all memory to upstream.
A monotonic_buffer_resource can be initialized with a buffer that will be used to satisfy all allocation requests, until the buffer is full. After that a new buffer will be allocated from the upstream resource. By using a stack buffer and pmr::null_memory_resource() as the upstream you can get a memory resource that only uses the stack and never dynamically allocates.
Definition at line 341 of file memory_resource.