Namespace
Varianti

std::unary_function

Da cppreference.com.
< cpp‎ | utility‎ | functional

 
 
Utilità libreria
Tipo di supporto (basic types, RTTI, type traits)
Gestione della memoria dinamica
La gestione degli errori
Programma di utilità
Funzioni variadic
Data e ora
Funzione oggetti
initializer_list(C++11)
bitset
hash(C++11)
Gli operatori relazionali
Original:
Relational operators
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rel_ops::operator!=
rel_ops::operator>
rel_ops::operator<=
rel_ops::operator>=
Coppie e tuple
Original:
Pairs and tuples
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pair
tuple(C++11)
piecewise_construct_t(C++11)
piecewise_construct(C++11)
Swap, in avanti e spostare
Original:
Swap, forward and move
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swap
forward(C++11)
move(C++11)
move_if_noexcept(C++11)
declval(C++11)
 
Funzione oggetti
Funzione wrapper
Original:
Function wrappers
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function(C++11)
mem_fn(C++11)
bad_function_call(C++11)
Associare
Original:
Bind
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bind(C++11)
is_bind_expression(C++11)
is_placeholder(C++11)
_1, _2, _3, ...(C++11)
Wrapper di riferimento
Original:
Reference wrappers
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reference_wrapper(C++11)
ref
cref
(C++11)
(C++11)
Operatore wrapper
Original:
Operator wrappers
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Negatori
Original:
Negators
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Sconsigliata a leganti e adattatori
Original:
Deprecated binders and adaptors
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unary_function(deprecato)
binary_function(deprecato)
ptr_fun(deprecato)
pointer_to_unary_function(deprecato)
pointer_to_binary_function(deprecato)
mem_fun(deprecato)
mem_fun_t
mem_fun1_t
const_mem_fun_t
const_mem_fun1_t
(deprecato)
(deprecato)
(deprecato)
(deprecato)
mem_fun_ref(deprecato)
mem_fun_ref_t
mem_fun1_ref_t
const_mem_fun_ref_t
const_mem_fun1_ref_t
(deprecato)
(deprecato)
(deprecato)
(deprecato)
binder1st
binder2nd
(deprecato)
(deprecato)
bind1st
bind2nd
(deprecato)
(deprecato)
 
Defined in header <functional>
template <typename ArgumentType, typename ResultType>
struct unary_function;
(deprecato)
unary_function è una classe di base per la creazione di oggetti funzione con un argomento.
Original:
unary_function is a base class for creating function objects with one argument.
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unary_function non operator() definire, si prevede che le classi derivate definirà questo. unary_function prevede solo due tipi - argument_type e result_type - definito dai parametri di modello.
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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Alcuni biblioteca standard adattatori oggetto funzione, come ad esempio std::not1, richiedono gli oggetti funzione si adattano ad avere certi tipi definiti; std::not1 richiede l'oggetto funzione essendo atto di avere un tipo denominato argument_type. Derivazione di oggetti funzione che richiede un argomento da unary_function è un modo semplice per renderli compatibili con tali schede.
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 è deprecato in C + +11. La sua funzionalità è stata resa obsoleta da std::function.
Original:
unary_function is deprecated in C++11. Its functionality has been made obsolete by std::function.
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[modifica] Membri tipi

Tipo
Original:
Type
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Definition
argument_type ArgumentType
result_type ResultType

[modifica] Esempio

#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; }))
        );
    */
}

Output:

3

[modifica] Vedi anche

(C++11)
avvolge oggetto invocabile di qualsiasi tipo con la firma specificato chiamata di funzione
Original:
wraps callable object of any type with specified function call signature
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(classe template) [edit]
(deprecato)
crea un adattatore compatibile con wrapper di oggetto funzione da un puntatore a funzione
Original:
creates an adaptor-compatible function object wrapper from a pointer to function
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(funzione di modello) [edit]
adattatore compatibile wrapper per un puntatore a funzione unaria
Original:
adaptor-compatible wrapper for a pointer to unary function
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(classe template) [edit]
(deprecato)
adattatore compatibile con la funzione di classe di base binaria
Original:
adaptor-compatible binary function base class
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(classe template) [edit]