std::remove, std::remove_if

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C++
 
算法库
功能
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Functions
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修改序列操作
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Non-modifying sequence operations
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all_of
any_of
none_of		（C++11）
（C++11）
（C++11）
for_each
count
count_if
mismatch
equal
修改序列操作
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Modifying sequence operations
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分区操作
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Partitioning operations
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is_partitioned（C++11）
partition
partition_copy（C++11）
排序操作（排序的区间）
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Sorting operations (on sorted ranges)
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is_sorted（C++11）
is_sorted_until（C++11）
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二进制搜索操作（排序的区间）
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Binary search operations (on sorted ranges)
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Set operations (on sorted ranges)
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Numeric operations
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C库
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C library
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Defined in header <algorithm>
template< class ForwardIt, class T >
ForwardIt remove( ForwardIt first, ForwardIt last, const T& value );
 (1)
template< class ForwardIt, class UnaryPredicate >
ForwardIt remove_if( ForwardIt first, ForwardIt last, UnaryPredicate p );
 (2)
满足特定条件的范围内[first, last)中移除所有元素。第一个版本中删除所有元素，等于value，第二个版本中删除所有元素的谓词p回报true.
Original:
Removes all elements satisfying specific criteria from the range [first, last). The first version removes all elements that are equal to value, the second version removes all elements for which predicate p returns true.
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卸下做是通过移动的元素的范围内以这样的方式，要被擦除的元素将被覆盖。元素之间的旧的和新的范围的两端有未指定的值。的迭代器返回到新的范围。被保留的元素的相对顺序.
Original:
Removing is done by shifting the elements in the range in such a way that elements to be erased are overwritten. The elements between the old and the new ends of the range have unspecified values. An iterator to the new end of the range is returned. Relative order of the elements that remain is preserved.
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目录

[编辑] 参数

first, last -
元素的范围内进行处理
Original:
the range of elements to process
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value -
要移除的元素的值
Original:
the value of elements to remove
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p - unary predicate which returns ​true
如果元素应该被删除
Original:
if the element should be removed
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.

The signature of the predicate function should be equivalent to the following:

bool pred(const Type &a);

The signature does not need to have const &, but the function must not modify the objects passed to it.
The type Type must be such that an object of type ForwardIt can be dereferenced and then implicitly converted to Type. ​

Type requirements
-
ForwardIt must meet the requirements of ForwardIterator.
-
The type of dereferenced ForwardIt must meet the requirements of MoveAssignable.

[编辑] 返回值

迭代器新的范围
Original:
Iterator to the new end of the range
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[编辑] 复杂性

究竟std::distance(first, last)的谓词中的应用.
Original:
Exactly std::distance(first, last) applications of the predicate.
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[编辑] 注释

类似的命名容器的成员函数list::remove，list::remove_if，forward_list::remove，forward_list::remove_if删除删除的元素.
Original:
The similarly-named container member functions list::remove, list::remove_if, forward_list::remove, and forward_list::remove_if erase the removed elements.
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[编辑] 可能的实现

First version 
template<class ForwardIt, class T>
ForwardIt remove(ForwardIt first, ForwardIt last, 
                       const T& value)
{
    ForwardIt result = first;
    for (; first != last; ++first) {
        if (!(*first == value)) {
            *result++ = *first;
        }
    }
    return result;
}
Second version 
template<class ForwardIt, class UnaryPredicate>
ForwardIt remove_if(ForwardIt first, ForwardIt last, 
                          UnaryPredicate p)
{
    ForwardIt result = first;
    for (; first != last; ++first) {
        if (!p(*first)) {
            *result++ = *first;
        }
    }
    return result;
}

[编辑] 为例

下面的代码从一个字符串中删除所有的空格，将它们移动到结尾的字符串，然后删除.
Original:
The following code removes all spaces from a string by moving them to the end of the string and then erasing.
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#include <algorithm>
#include <string>
#include <iostream>
int main()
{
    std::string str = "Text with some   spaces";
    str.erase(std::remove(str.begin(), str.end(), ' '),
              str.end());
    std::cout << str << '\n';
}

Output: 

Textwithsomespaces

[编辑] 另请参阅
复制一个范围内的元素省略了那些满足特定的条件
Original:
copies a range of elements omitting those that satisfy specific criteria
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（函数模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/algorithm/remove&oldid=27817”