bslma_managedallocator.h

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/// @file bslma_managedallocator.h
///
/// The content of this file has been pre-processed for Doxygen.
///
 
 
// bslma_managedallocator.h                                           -*-C++-*-
#ifndef INCLUDED_BSLMA_MANAGEDALLOCATOR
#define INCLUDED_BSLMA_MANAGEDALLOCATOR
 
#include <bsls_ident.h>
BSLS_IDENT("$Id: $")
 
/// @defgroup bslma_managedallocator bslma_managedallocator
/// @brief  Provide a protocol for memory allocators that support `release`.
/// @addtogroup bsl
/// @{
/// @addtogroup bslma
/// @{
/// @addtogroup bslma_managedallocator
/// @{
///
/// <h1> Outline </h1>
/// * <a href="#bslma_managedallocator-purpose"> Purpose</a>
/// * <a href="#bslma_managedallocator-classes"> Classes </a>
/// * <a href="#bslma_managedallocator-description"> Description </a>
///   * <a href="#bslma_managedallocator-usage"> Usage </a>
///
/// # Purpose {#bslma_managedallocator-purpose}
/// Provide a protocol for memory allocators that support `release`.
///
/// @deprecated  use @ref bdlma_managedallocator  instead.
///
/// # Classes {#bslma_managedallocator-classes}
///
/// -  bslma::ManagedAllocator: protocol for allocators with `release` capability
///
/// @see  bslma_allocator
///
/// # Description {#bslma_managedallocator-description}
/// This component provides a protocol (pure abstract interface)
///  class, `bslma::ManagedAllocator`, which extends the base-level protocol
///  class, `bslma::Allocator`, providing the ability to `release` all memory
///  currently allocated through the protocol back to the memory supplier of the
///  derived concrete allocator object.
/// @code
///  ,-----------------------.
/// ( bslma::ManagedAllocator )
///  `-----------------------'
///              |       release
///              V
///      ,----------------.
///     ( bslma::Allocator )
///      `----------------'
///                      allocate
///                      deallocate
/// @endcode
///
/// ## Usage {#bslma_managedallocator-usage}
///
///
/// The `bslma::ManagedAllocator` protocol class serves as a useful internal
/// interface for documentation purpose and could be used as a parameter to
/// low-level helper functions for some implementations.  We have yet to find a
/// suitable real-world example and when one becomes available, it will be
/// added.
/// @}
/** @} */
/** @} */
 
/** @addtogroup bsl
 * @{
 */
/** @addtogroup bslma
 * @{
 */
/** @addtogroup bslma_managedallocator
 * @{
 */
 
#ifdef BDE_OPENSOURCE_PUBLICATION // DEPRECATED
#error "bslma_managedallocator is deprecated"
#endif
#include <bslscm_version.h>
 
#include <bslma_allocator.h>
 
 
 
namespace bslma {
 
                        // ======================
                        // class ManagedAllocator
                        // ======================
 
/// Provide a protocol for allocators with the ability to `release` all
/// memory currently allocated through the protocol back to the memory
/// supplier of the derived concrete allocator object.
///
/// See @ref bslma_managedallocator 
class ManagedAllocator : public Allocator {
 
  private:
    // PRIVATE ACCESSORS
 
    /// Do nothing.  Note that this function is added to avoid including a
    /// (redundant) vtable into every translation unit that includes this
    /// type.  Although we expect that these redundant vtables, identified
    /// by the `-Wweak-vtables` warning of the clang compiler (version 4.0
    /// and higher), will be consolidated by the linker, this workaround
    /// avoids the space being used in the generated object files, which may
    /// be important for very heavily used types like this one.
    /// Implementing a virtual function out-of-line enables the compiler to
    /// use this component translation unit as a "home" for the single
    /// shared copy of the vtable.
    virtual void vtableDummy() const;
 
  public:
    // MANIPULATORS
 
    /// Release all memory currently allocated through this allocator.
    virtual void release() = 0;
};
 
}  // close package namespace
 
#ifndef BDE_OPENSOURCE_PUBLICATION  // BACKWARD_COMPATIBILITY
// ============================================================================
//                           BACKWARD COMPATIBILITY
// ============================================================================
 
/// This alias is defined for backward compatibility.
typedef bslma::ManagedAllocator bslma_ManagedAllocator;
#endif  // BDE_OPENSOURCE_PUBLICATION -- BACKWARD_COMPATIBILITY
 
 
 
#endif
 
// ----------------------------------------------------------------------------
// Copyright 2013 Bloomberg Finance L.P.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ----------------------------- END-OF-FILE ----------------------------------
 
/** @} */
/** @} */
/** @} */