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std::unary_negate

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< cpp‎ | utility‎ | functional

 
 
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initializer_list(C++11)
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Relational operators
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Operator wrappers
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否定子
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Negators
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unary_negate
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バインダーおよびアダプタは非推奨になりました
Original:
Deprecated binders and adaptors
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unary_function(廃止予定)
binary_function(廃止予定)
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Defined in header <functional>
template< class Predicate >
struct unary_negate : public std::unary_function<Predicate::argument_type, bool>;
(C++11以前)
template< class Predicate >
struct unary_negate;
(C++11およびそれ以降)
unary_negateラッパー関数オブジェクトは、それが保持​​単項述語の補数を返しています.
Original:
unary_negate is a wrapper function object returning the complement of the unary predicate it holds.
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単項述語のタイプは、メンバータイプ、述部のパラメーター·タイプに変換可能であるargument_typeを定義する必要があります。 std::refから得単項関数オブジェクト、std::crefstd::negatestd::logical_notstd::mem_fnstd::functionstd::hash、または別の呼び出しからstd::not1非推奨std::unary_functionから派生した関数オブジェクトがあるので、このタイプは、定義されている.
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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unary_negateオブジェクトを容易にstd::not1ヘルパー関数を使用して構築されて.
Original:
unary_negate objects are easily constructed with helper function std::not1.
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目次

[編集] メンバータイプ

タイプ
Original:
Type
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Definition
argument_type Predicate::argument_type
result_type bool

[編集] メンバ関数

(constructor)
constructs a new unary_negate object with the supplied predicate
(パブリックメンバ関数)
operator()
格納された述語の呼び出しの結果の論理補数を返します
Original:
returns the logical complement of the result of a call to the stored predicate
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(パブリックメンバ関数)

のstd :: unary_negate ::
Original:
std::unary_negate::
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unary_negate

explicit unary_negate( Predicate const& pred );

Constructs a unary_negate function object with the stored predicate pred.

Parameters

pred -
述語関数オブジェクト
Original:
predicate function object
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のstd :: unary_negate ::
Original:
std::unary_negate::
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operator()

bool operator()( argument_type const& x ) const;

Returns the logical complement of the result of calling pred(x).

Parameters

x -
述語に渡すための引数
Original:
argument to pass through to predicate
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Return value

The logical complement of the result of calling pred(x).

[編集]

#include <algorithm>
#include <functional>
#include <iostream>
#include <vector>
 
struct less_than_7 : 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::unary_negate<less_than_7> not_less_than_7((less_than_7()));
 
    std::cout << std::count_if(v.begin(), v.end(), not_less_than_7);
 
    /* C++11 solution:
        // Use std::function<bool (int)>
        std::function<bool (int)> not_less_than_7 =
            [](int x)->bool{ return !less_than_7()(x); };
 
        std::cout << std::count_if(v.begin(), v.end(), not_less_than_7);
    */
}

Output:

3

[編集] も参照してください

ラッパー関数オブジェクトは、それが保持​​するバイナリ述語の補数を返す
Original:
wrapper function object returning the complement of the binary predicate it holds
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(クラステンプレート) [edit]
(C++11)
指定された関数呼び出しシグネチャを持つ任意の型の呼び出し可能オブジェクトをラップします
Original:
wraps callable object of any type with specified function call signature
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(クラステンプレート) [edit]
カスタムstd::unary_negateオブジェクトを作成します
Original:
constructs custom std::unary_negate object
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(関数テンプレート) [edit]
(廃止予定)
関数へのポインタからアダプタと互換性のある関数オブジェクトのラッパーを作成します
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
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(関数テンプレート) [edit]
(廃止予定)
アダプタと互換性の単項関数基底クラス
Original:
adaptor-compatible unary function base class
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(クラステンプレート) [edit]