std::uninitialized_copy

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uninitialized_copy
uninitialized_copy_n（C++11）
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Defined in header <memory>
template< class InputIt, class Size, class ForwardIt >
ForwardIt uninitialized_copy_n( InputIt first, Size count, ForwardIt d_first);
 （C++11 起）
副本countfirst一个未初始化的内存区开始在d_first开始了一系列的元素。使用拷贝构造函数构造中的元素未初始化的区域.
Original:
Copies count elements from a range beginning at first to an uninitialized memory area beginning at d_first. The elements in the uninitialized area are constructed using copy constructor.
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在初始化过程中，如果抛出一个异常，该函数有没有影响。
本节是不完整的
原因: update possible implementation to reflect this
Original:
If an exception is thrown during the initialization, the function has no effects.
本节是不完整的
原因: update possible implementation to reflect this
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目录

[编辑] 参数

first -
要复制的元素的范围内的开始
Original:
the beginning of the range of the elements to copy
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d_first -
的目标范围的开头
Original:
the beginning of the destination range
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Type requirements
-
InputIt must meet the requirements of InputIterator.
-
ForwardIt must meet the requirements of ForwardIterator.

[编辑] 返回值

过去的最后一个元素的元素的迭代器，复制.
Original:
Iterator to the element past the last element copied.
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[编辑] 复杂性

线性count.
Original:
Linear in count.
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[编辑] 可能的实现

template<class InputIt, class Size, class ForwardIt>
ForwardIt uninitialized_copy_n(InputIt first, Size count, ForwardIt d_first)
{
    typedef typename std::iterator_traits<ForwardIt>::value_type Value;
    for (; count > 0; ++first, ++d_first, --count) {
        ::new (static_cast<void*>(&*d_first)) Value(*first);
    }
    return d_first;
}

[编辑] 为例

本节是不完整的
原因: no example

[编辑] 另请参阅
一个未初始化的内存区域复制的对象范围
Original:
copies a range of objects to an uninitialized area of memory
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（函数模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/memory/uninitialized_copy_n&oldid=26892”