std::not1

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not1
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Defined in header <functional>
template< class Predicate >
std::unary_negate<Predicate> not1(const Predicate& pred);
not1是一個輔助函數來創建一個函數對象，返回的補元謂詞函數傳遞。該函數創建的對象的類型std::unary_negate<Predicate>.
Original:
not1 is a helper function to create a function object that returns the complement of the unary predicate function passed. The function object created is of type std::unary_negate<Predicate>.
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一元謂詞的類型必須定義一個成員的類型，argument_type，也就是轉換為謂詞的參數類型。從std::ref獲得一元函數對象，std::cref，std::negate，std::logical_not，std::mem_fn，std::function，std::hash，或從另一個呼叫std::not1這種類型的定義，函數對象來自過時的std::unary_function.
Original:
The unary predicate type must define a member type, argument_type, that is convertible to the predicate's parameter type. The unary function objects obtained from std::ref, std::cref, std::negate, std::logical_not, std::mem_fn, std::function, std::hash, or from another call to std::not1 have this type defined, as are function objects derived from the deprecated std::unary_function.
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目錄

[编辑] 參數

pred -
一元謂詞
Original:
unary predicate
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[编辑] 返回值

std::not1返回一個對象的類型std::unary_negate<Predicate>，構建pred.
Original:
std::not1 returns an object of type std::unary_negate<Predicate>, constructed with pred.
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[编辑] 例外

無
Original:
None.
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[编辑] 為例

#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
 
struct LessThan7 : std::unary_function<int, bool>
{
    bool operator()(int i) const { return i < 7; }
};
 
int main()
{
    std::vector<int> v;
    for (int i = 0; i < 10; ++i) {
        v.push_back(i);
    }
 
    std::cout << std::count_if(v.begin(), v.end(), std::not1(LessThan7())) << "\n";
 
    //same as above, but use a lambda function
    std::function<int(int)> less_than_9 = [](int x){ return x < 9; };
    std::cout << std::count_if(v.begin(), v.end(), std::not1(less_than_9)) << "\n";
}

Output: 

3

[编辑] 另請參閱
包裝函數對象返回的補一元謂詞其持有的
Original:
wrapper function object returning the complement of the unary predicate it holds
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（類模板） [edit]
（C++11）
包裝任何類型的可調用對象與指定的函數調用簽名
Original:
wraps callable object of any type with specified function call signature
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（類模板） [edit]
構造自定義std::binary_negate對象
Original:
constructs custom std::binary_negate object
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（函數模板） [edit]
（過時了）
創建適配器兼容功能的包裝對象從一個指針到函數
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
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（函數模板） [edit]
（過時了）
適配器兼容的一元函數的基類
Original:
adaptor-compatible unary function base class
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（類模板） [edit]
来自“http://zh.cppreference.com/mwiki/index.php?title=cpp/utility/functional/not1&oldid=26592”