# std::experimental::pmr::monotonic_buffer_resource::monotonic_buffer_resource

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< cpp‎ | experimental‎ | monotonic buffer resource

monotonic_buffer_resource(); | (1) | (library fundamentals TS)
explicit monotonic_buffer_resource(memory_resource* upstream); | (2) | (library fundamentals TS)
explicit monotonic_buffer_resource(std::size_t initial_size); | (3) | (library fundamentals TS)
monotonic_buffer_resource(std::size_t initial_size, memory_resource* upstream); | (4) | (library fundamentals TS)
monotonic_buffer_resource(void* buffer, std::size_t buffer_size); | (5) | (library fundamentals TS)
monotonic_buffer_resource(void* buffer, std::size_t buffer_size, memory_resource* upstream); | (6) | (library fundamentals TS)
monotonic_buffer_resource(const monotonic_buffer_resource&) = delete; | (7) | (library fundamentals TS)

Constructs a `monotonic_buffer_resource`. The constructors not taking a upstream memory resource pointer uses the return value of std::experimental::pmr::get_default_resource() as the upstream memory resource.

1-2) Sets the current buffer to null and the next buffer size to an implementation-defined size.
3-4) Sets the current buffer to null and the next buffer size to a size no smaller than `initial_size`.
5-6) Sets the current buffer to `buffer` and the next buffer size to `buffer_size` (but not less than 1). Then increase the next buffer size by an implementation-defined growth factor (which does not have to be integral).
7) Copy constructor is deleted.

### Parameters

upstream | - | the upstream memory resource to use; must point to a valid memory resource
initial_size | - | the minimum size of the first buffer to allocate; must be greater than zero
buffer | - | the initial buffer to use
buffer_size | - | the size of the initial buffer; cannot be greater than the number of bytes in `buffer`

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