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std::unary_function

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C++
 
Biblioteca de utilitários
Digite apoio (basic types, RTTI, type traits)
Gerenciamento de memória dinâmica
De tratamento de erros
Utilidades do programa
Variadic funções
Data e hora
Objetos de função
(C++11)
(C++11)
Os operadores relacionais
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Pares e tuplas
Original:
Pairs and tuples
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(C++11)
(C++11)
(C++11)
Troque, avançar e avançar
Original:
Swap, forward and move
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(C++11)
(C++11)
(C++11)
(C++11)
 
Objetos de função


Invólucros de função
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Function wrappers
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(C++11)
(C++11)
(C++11)
Ligar
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Bind
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(C++11)
(C++11)
(C++11)
(C++11)
Invólucros de referência
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Reference wrappers
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(C++11)
(C++11)(C++11)
Invólucros operador
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Operator wrappers
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Negadores
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Negators
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Obsoleta ligantes e adaptadores
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Deprecated binders and adaptors
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unary_function
(obsoleta)
(obsoleta)
(obsoleta)
(obsoleta)
(obsoleta)
(obsoleta)
(obsoleta)(obsoleta)(obsoleta)(obsoleta)
(obsoleta)
(obsoleta)(obsoleta)(obsoleta)(obsoleta)
(obsoleta)(obsoleta)
(obsoleta)(obsoleta)
 
Definido no cabeçalho <functional>
template <typename ArgumentType, typename ResultType>
struct unary_function;
 (obsoleta)
unary_function é uma classe base para a criação de objetos de função com um argumento.
Original:
unary_function is a base class for creating function objects with one argument.
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unary_function não define operator(); espera-se que as classes derivadas vai definir este. unary_function oferece apenas dois tipos - argument_type e result_type - definida pelos parâmetros do modelo.
Original:
unary_function does not define operator(); it is expected that derived classes will define this. unary_function provides only two types - argument_type and result_type - defined by the template parameters.
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Alguns biblioteca padrão adaptadores função de objeto, como std::not1, exigem que os objetos de função que se adaptam a ter certos tipos definidos; std::not1 requer o objeto de função que est�� sendo adaptado para ter um tipo chamado argument_type. Derivando objetos de função que levam um argumento de unary_function é uma maneira fácil de fazê-los compatíveis com os adaptadores.
Original:
Some standard library function object adaptors, such as std::not1, require the function objects they adapt to have certain types defined; std::not1 requires the function object being adapted to have a type named argument_type. Deriving function objects that take one argument from unary_function is an easy way to make them compatible with those adaptors.
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unary_function é preterido em C + 11. Sua funcionalidade foi tornada obsoleta pela std::function.
Original:
unary_function is deprecated in C++11. Its functionality has been made obsolete by std::function.
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[editar] Tipos de membro

Tipo
Original:
Type
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 Definition
argument_type ArgumentType
result_type ResultType

[editar] Exemplo

#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::cout << std::count_if(v.begin(), v.end(), std::not1(less_than_7()));
 
    /* C++11 solution:
        // Cast to std::function<bool (int)> somehow - even with a lambda
        std::cout << std::count_if(v.begin(), v.end(),
            std::not1(std::function<bool (int)>([](int i){ return i < 7; }))
        );
    */
}

Saída: 

3

[editar] Veja também

(C++11)
envolve objeto que pode ser chamado de qualquer tipo com a assinatura especificada função chamada
Original:
wraps callable object of any type with specified function call signature
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(modelo de classe) [edit]
(obsoleta)
cria um adaptador compatível com invólucro objeto de função de um ponteiro para função
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
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(modelo de função) [edit]
(obsoleta)
adaptador compatível com invólucro para um ponteiro para função unário
Original:
adaptor-compatible wrapper for a pointer to unary function
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(modelo de classe) [edit]
(obsoleta)
adaptador compatível binário classe base função
Original:
adaptor-compatible binary function base class
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(modelo de classe) [edit]
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