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The standard library offers several copy-based algorithms. Some of them, like
std::copy
or std::uninitialized_copy
are basic building blocks for containers and other data structures. This library
offers move-based functions for those purposes:
template<typename I, typename O> O move(I, I, O); template<typename I, typename O> O move_backward(I, I, O); template<typename I, typename F> F uninitialized_move(I, I, F); template<typename I, typename F> F uninitialized_copy_or_move(I, I, F);
The first 3 are move variations of their equivalent copy algorithms, but copy
assignment and copy construction are replaced with move assignment and construction.
The last one has the same behaviour as std::uninitialized_copy
but since several standand library implementations don't play very well with
move_iterator
s, this version
is a portable version for those willing to use move iterators.
#include "movable.hpp" #include <cassert> #include <boost/aligned_storage.hpp> int main() { const std::size_t ArraySize = 10; movable movable_array[ArraySize]; movable movable_array2[ArraySize]; //move boost::move(&movable_array2[0], &movable_array2[ArraySize], &movable_array[0]); assert(movable_array2[0].moved()); assert(!movable_array[0].moved()); //move backward boost::move_backward(&movable_array[0], &movable_array[ArraySize], &movable_array2[ArraySize]); assert(movable_array[0].moved()); assert(!movable_array2[0].moved()); //uninitialized_move boost::aligned_storage< sizeof(movable)*ArraySize , boost::alignment_of<movable>::value>::type storage; movable *raw_movable = static_cast<movable*>(static_cast<void*>(&storage)); boost::uninitialized_move(&movable_array2[0], &movable_array2[ArraySize], raw_movable); assert(movable_array2[0].moved()); assert(!raw_movable[0].moved()); return 0; }