///////////////////////////////////////////////////////////////////////////////////
/// OpenGL Mathematics (glm.g-truc.net)
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/// @ref gtx_range
/// @file glm/gtx/range.hpp
/// @date 2014-09-19 / 2014-09-19
/// @author Joshua Moerman
///
/// @defgroup gtx_range GLM_GTX_range
/// @ingroup gtx
///
/// @brief Defines begin and end for vectors and matrices. Useful for range-based for loop.
/// The range is defined over the elements, not over columns or rows (e.g. mat4 has 16 elements).
///
/// <glm/gtx/range.hpp> need to be included to use these functionalities.
///////////////////////////////////////////////////////////////////////////////////

#pragma once

// Dependencies
#include "../detail/setup.hpp"

#if !GLM_HAS_RANGE_FOR
#       error "GLM_GTX_range requires C++11 suppport or 'range for'"
#endif

#include "../gtc/type_ptr.hpp"

namespace glm{
namespace detail
{
        /* The glm types provide a .length() member, but for matrices
         this only defines the number of columns, so we need to work around this */

        template <typename T, precision P>
        detail::component_count_t number_of_elements_(tvec2<T, P> const & v){
                return detail::component_count(v);
        }

        template <typename T, precision P>
        detail::component_count_t number_of_elements_(tvec3<T, P> const & v){
                return detail::component_count(v);
        }

        template <typename T, precision P>
        detail::component_count_t number_of_elements_(tvec4<T, P> const & v){
                return detail::component_count(v);
        }

        template <typename genType>
        detail::component_count_t number_of_elements_(genType const & m){
                return detail::component_count(m) * detail::component_count(m[0]);
        }
}//namespace

        /// @addtogroup gtx_range
        /// @{

        template <typename genType>
        const typename genType::value_type * begin(genType const & v){
                return value_ptr(v);
        }

        template <typename genType>
        const typename genType::value_type * end(genType const & v){
                return begin(v) + detail::number_of_elements_(v);
        }

        template <typename genType>
        typename genType::value_type * begin(genType& v){
                return value_ptr(v);
        }

        template <typename genType>
        typename genType::value_type * end(genType& v){
                return begin(v) + detail::number_of_elements_(v);
        }

        /// @}
}//namespace glm