std::unary_negate

 

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关系运算符 Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

双和元组 Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple （C++11）

piecewise_construct_t （C++11）

piecewise_construct （C++11）

掉期，远期和移动 Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

forward （C++11）

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函数对象

功能包装 Original: Function wrappers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
function （C++11）
mem_fn （C++11）
bad_function_call （C++11）
绑定 Original: Bind The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
bind （C++11）
is_bind_expression （C++11）
is_placeholder （C++11）
_1, _2, _3, ... （C++11）
参考包装 Original: Reference wrappers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
reference_wrapper （C++11）
ref cref （C++11） （C++11）
操作包装 Original: Operator wrappers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
plus minus negate multiplies divides modulus logical_and logical_or logical_not	equal_to not_equal_to greater less greater_equal less_equal bit_and bit_or bit_xor
否定词 Original: Negators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
unary_negate binary_negate	not1 not2
已过时粘合剂和适配器 Original: Deprecated binders and adaptors The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
unary_function （过时了）
binary_function （过时了）
ptr_fun （过时了）
pointer_to_unary_function （过时了）
pointer_to_binary_function （过时了）
mem_fun （过时了）
mem_fun_t mem_fun1_t const_mem_fun_t const_mem_fun1_t （过时了） （过时了） （过时了） （过时了）
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mem_fun_ref_t mem_fun1_ref_t const_mem_fun_ref_t const_mem_fun1_ref_t （过时了） （过时了） （过时了） （过时了）
binder1st binder2nd （过时了） （过时了）
bind1st bind2nd （过时了） （过时了）

 

Defined in header <functional>
template< class Predicate > struct unary_negate : public std::unary_function<Predicate::argument_type, bool>;		（至 C++11）
template< class Predicate > struct unary_negate;		（C++11 起）

unary_negate是一个包装函数对象，一元谓词其持有的返回的补.

Original:

unary_negate is a wrapper function object returning the complement of the unary predicate it holds.

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一元谓词的类型必须定义一个成员的类型，argument_type，也就是转换为谓词的参数类型。从std::ref获得一元函数对象，std::cref，std::negate，std::logical_not，std::mem_fn，std::function，std::hash，或从另一个呼叫std::not1这种类型的定义，函数对象来自过时的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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unary_negate对象很容易构造辅助函数std::not1.

Original:

unary_negate objects are easily constructed with helper function std::not1.

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会员类型

类型 Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.	Definition
argument_type	Predicate::argument_type
result_type	bool

成员函数

(constructor)	constructs a new unary_negate object with the supplied predicate （公共成员函数）
operator()	返回的逻辑补码的呼叫的结果，所存储的谓词 Original: returns the logical complement of the result of a call to the stored predicate The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （公共成员函数）

的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

-

谓词函数对象 Original: predicate function object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

的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

-

参数传递到谓词 Original: argument to pass through to predicate The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Return value

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

为例

#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

另请参阅

binary_negate	包装函数对象返回的补其所持有的二元谓词 Original: wrapper function object returning the complement of the binary predicate it holds The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （类模板）
function （C++11）	包装任何类型的可调用对象与指定的函数调用签名 Original: wraps callable object of any type with specified function call signature The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （类模板）
not1	构造自定义std::unary_negate对象 Original: constructs custom std::unary_negate object The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）
ptr_fun （过时了）	创建适配器兼容功能的包装对象从一个指针到函数 Original: creates an adaptor-compatible function object wrapper from a pointer to function The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （函数模板）
unary_function （过时了）	适配器兼容的一元函数的基类 Original: adaptor-compatible unary function base class The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. （类模板）