Intrinsics.hxx

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//
// Created by 蒋志平 on 2024/8/31.
//
 
#ifndef FASTMEMCPY_HXX
#define FASTMEMCPY_HXX
 
#include <iterator>
#include <type_traits>
 
namespace Intrinsics {
    void* fastMemcpy(void* destAddress, const void* sourceAddress, size_t numBytes2Copy);
 
    template<typename InputIterator, typename OutputIterator,
             typename = std::enable_if_t<std::is_trivially_copyable_v<typename std::iterator_traits<InputIterator>::value_type>>,
             typename = std::enable_if_t<std::is_same_v<typename std::iterator_traits<OutputIterator>::iterator_category, std::random_access_iterator_tag>>>
    OutputIterator fastCopyN(InputIterator first, std::size_t count, OutputIterator result) {
        using ValueType = typename std::iterator_traits<InputIterator>::value_type;
        fastMemcpy(&*result, &*first, count * sizeof(ValueType));
        return result + count;
    }
 
    template<typename InputIterator, typename OutputIterator,
             typename = std::enable_if_t<std::is_trivially_copyable_v<typename std::iterator_traits<InputIterator>::value_type>>,
             typename = std::enable_if_t<std::is_same_v<typename std::iterator_traits<OutputIterator>::iterator_category, std::random_access_iterator_tag>>>
    OutputIterator fastCopy(InputIterator first, InputIterator last, OutputIterator result) {
        return fastCopyN(first, last - first, result);
    }
}
 
#endif //FASTMEMCPY_HXX