复制数据的快速方法std::copy C++复制数据各种方法大家都会,很多时候我们都会用到std::copy这个STL函数,这个效率确实很不错,比我们一个一个元素复制或者用迭代器复制都来的要快很多. 比如,我写了一段下面的代码,复制100000000数据量,std::copy的性能要比前两个性能要好. ; int *k = new int[size]; int *p = new int[size]; //const int size = 5F5E100h; DWORD t1, t2; t1…
Defined in header <iterator> template< class T, class CharT = char, class Traits = std::char_traits<CharT>> class ostream_iterator : public std::iterator<std::output_iterator_tag, void, void, void, void> std::ostream_it…
There is a critical difference between std::fill and memset that is very important to understand. std::fill sets each element to the specified value. memset sets each byte to a specified value. While they won't produce incorrect results when used app…