整理

include/boost/container/pmr/pool_options.hpp

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+//////////////////////////////////////////////////////////////////////////////
+//
+// (C) Copyright Ion Gaztanaga 2015-2015. Distributed under the Boost
+// Software License, Version 1.0. (See accompanying file
+// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+// See http://www.boost.org/libs/container for documentation.
+//
+//////////////////////////////////////////////////////////////////////////////
+
+#ifndef BOOST_CONTAINER_PMR_POOL_OPTIONS_HPP
+#define BOOST_CONTAINER_PMR_POOL_OPTIONS_HPP
+
+#if defined (_MSC_VER)
+#  pragma once 
+#endif
+
+#include <cstddef>
+
+namespace boost {
+namespace container {
+namespace pmr {
+
+//! The members of pool_options comprise a set of constructor options for pool resources.
+//! The effect of each option on the pool resource behavior is described below:
+//!
+//! - `std::size_t max_blocks_per_chunk`: The maximum number of blocks that will be allocated
+//!   at once from the upstream memory resource to replenish a pool. If the value of
+//!   `max_blocks_per_chunk` is zero or is greater than an implementation-defined limit,
+//!   that limit is used instead. The implementation may choose to use a smaller value
+//!   than is specified in this field and may use different values for different pools.
+//!
+//! - `std::size_t largest_required_pool_block`: The largest allocation size that is required
+//!   to be fulfilled using the pooling mechanism. Attempts to allocate a single block
+//!   larger than this threshold will be allocated directly from the upstream memory
+//!   resource. If largest_required_pool_block is zero or is greater than an
+//!   implementation-defined limit, that limit is used instead. The implementation may
+//!   choose a pass-through threshold larger than specified in this field.
+struct pool_options
+{
+   pool_options()
+      : max_blocks_per_chunk(0u), largest_required_pool_block(0u)
+   {}
+   std::size_t max_blocks_per_chunk;
+   std::size_t largest_required_pool_block;
+};
+
+}  //namespace pmr {
+}  //namespace container {
+}  //namespace boost {
+
+#endif   //BOOST_CONTAINER_PMR_POOL_OPTIONS_HPP