type_utils.h

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#ifndef AUDIOGRAPHER_TYPE_UTILS_H
#define AUDIOGRAPHER_TYPE_UTILS_H
 
#include <boost/static_assert.hpp>
#include <boost/type_traits.hpp>
#include <memory>
#include <algorithm>
#include <cstring>
 
#include "audiographer/visibility.h"
#include "audiographer/types.h"
 
namespace AudioGrapher
{
 
class LIBAUDIOGRAPHER_API TypeUtilsBase
{
  protected:
 
        template<typename T, bool b>
        static void do_zero_fill(T * buffer, samplecnt_t samples, const boost::integral_constant<bool, b>&)
                { std::uninitialized_fill_n (buffer, samples, T()); }
 
        template<typename T>
        static void do_zero_fill(T * buffer, samplecnt_t samples, const boost::true_type&)
                { memset (buffer, 0, samples * sizeof(T)); }
};
 
template<typename T = DefaultSampleType>
class /*LIBAUDIOGRAPHER_API*/ TypeUtils : private TypeUtilsBase
{
        BOOST_STATIC_ASSERT (boost::has_trivial_destructor<T>::value);
 
        typedef boost::integral_constant<bool,
                        boost::is_floating_point<T>::value ||
                        boost::is_signed<T>::value> zero_fillable;
  public:
        inline static void zero_fill (T * buffer, samplecnt_t samples)
                { do_zero_fill(buffer, samples, zero_fillable()); }
 
        inline static void copy (T const * source, T * destination, samplecnt_t samples)
                { std::uninitialized_copy (source, &source[samples], destination); }
 
        inline static void move (T const * source, T * destination, samplecnt_t samples)
        {
                if (destination < source) {
                        std::copy (source, &source[samples], destination);
                } else if (destination > source) {
                        std::copy_backward (source, &source[samples], destination + samples);
                }
        }
};
 
 
} // namespace
 
#endif // AUDIOGRAPHER_TYPE_UTILS_H