ContainerReadOnlyProxyAccessor.h

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/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          http://www.mrpt.org/                          |
   |                                                                        |
   | Copyright (c) 2005-2018, Individual contributors, see AUTHORS file     |
   | See: http://www.mrpt.org/Authors - All rights reserved.                |
   | Released under BSD License. See details in http://www.mrpt.org/License |
   +------------------------------------------------------------------------+ */
#pragma once
 
#include <cstdlib>  // size_t
#include <mrpt/core/exceptions.h>
 
namespace mrpt
{
namespace containers
{
/** \addtogroup stlext_grp
  * @{ */
 
/** A generic proxy accessor template that only allows read-only access to the
 * original binded STL container object. */
template <typename STLCONTAINER>
struct ContainerReadOnlyProxyAccessor
{
        /** ctor: binds to source object */
        ContainerReadOnlyProxyAccessor(STLCONTAINER& source) : m_source(source) {}
        /** (Deleted ctor) ignore copies (keep reference to original object) */
        ContainerReadOnlyProxyAccessor(
                const ContainerReadOnlyProxyAccessor<STLCONTAINER>&) = delete;
        /** Don't copy the reference to the source object, but copy the contained
         * data. This is only allowed if the size of the buffers coincide. */
        ContainerReadOnlyProxyAccessor<STLCONTAINER>& operator=(
                const ContainerReadOnlyProxyAccessor<STLCONTAINER>& o)
        {
                ASSERT_EQUAL_(m_source.size(), o.m_source.size());
                m_source = o.m_source;
                return *this;
        }
        /** Transparent conversion to const ref to original source object. */
        operator const STLCONTAINER&() const { return m_source; }
        size_t size() const { return m_source.size(); }
        const typename STLCONTAINER::value_type& operator[](const int i) const
        {
                return m_source[i];
        }
 
        typename STLCONTAINER::const_iterator begin() const
        {
                return m_source.begin();
        }
        typename STLCONTAINER::const_iterator end() const { return m_source.end(); }
        typename STLCONTAINER::const_reverse_iterator rbegin() const
        {
                return m_source.rbegin();
        }
        typename STLCONTAINER::const_reverse_iterator rend() const
        {
                return m_source.rend();
        }
 
   private:
        STLCONTAINER& m_source;
};
 
/** @} */  // end of grouping
}
}