operator==,!=,<,<=,>,>=(std::tuple)

<metanoindex/>

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari (C++11)

Operazioni atomicche (C++11)

Multithreading (C++11)

 

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 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>=

Coppie e tuple 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)

Swap, in avanti e spostare 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)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

std::tuple

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple::tuple

tuple::operator=

tuple::swap

Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

make_tuple

tie

forward_as_tuple

None

operator= operator!= operator< operator<= operator> operator>=

std::swap

get

Helper classi Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple_size

tuple_element

uses_allocator

ignore

 

<tbody> </tbody>

Elemento definito nell'header <tuple>
template< class... TTypes, class... UTypes > bool operator==( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs );	(1)	(dal C++11)
template< class... TTypes, class... UTypes > bool operator!=( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs );	(2)	(dal C++11)
template< class... TTypes, class... UTypes > bool operator<( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs );	(3)	(dal C++11)
template< class... TTypes, class... UTypes > bool operator<=( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs );	(5)	(dal C++11)
template< class... TTypes, class... UTypes > bool operator>( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs );	(4)	(dal C++11)
template< class... TTypes, class... UTypes > bool operator>=( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs );	(6)	(dal C++11)

1-2)

Confronta ogni elemento del lhs tupla con l'elemento corrispondente della rhs tupla.

Original:

Compares every element of the tuple lhs with the corresponding element of the tuple rhs.

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3-6)

Confronta lhs e rhs lessicografico, cioè, a confronto i primi elementi, se sono equivalenti, confronta i secondi elementi, se questi sono equivalenti, confronta i terzi elementi, e così via.

Original:

Compares lhs and rhs lexicographically, that is, compares the first elements, if they are equivalent, compares the second elements, if those are equivalent, compares the third elements, and so on.

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Tutti gli operatori di confronto sono in corto circuito e non accedere agli elementi di tuple al di là di quanto è necessario per determinare il risultato del confronto.

Original:

All comparison operators are short-circuited; they do not access tuple elements beyond what is necessary to determine the result of the comparison.

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Parametri

lhs, rhs

-

tuple da confrontare Original: tuples to compare The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

1)

true std::get<i>(lhs) == std::get<i>(rhs) se per ogni i in [0, sizeof...(Types)), altrimenti false. Per due corse a vuoto dei tuple true.

Original:

true if std::get<i>(lhs) == std::get<i>(rhs) for all i in [0, sizeof...(Types)), otherwise false. For two empty tuples returns true.

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2) !(lhs == rhs)

3)

(bool)(std::get<0>(lhs) < std::get<0>(rhs)) || (!(bool)(std::get<0>(rhs) < std::get<0>(lhs)) && lhstail < rhstail), dove è lhstail ss senza il suo primo elemento, e rhstail è sd senza il suo primo elemento. Per due tuple vuote, restituisce false.

Original:

(bool)(std::get<0>(lhs) < std::get<0>(rhs)) || (!(bool)(std::get<0>(rhs) < std::get<0>(lhs)) && lhstail < rhstail), where lhstail is lhs without its first element, and rhstail is rhs without its first element. For two empty tuples, returns false.

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4) !(lhs < rhs)

5) rhs < lhs

6) !(rhs < lhs)

Esempio

Perché <operatore è definito per le tuple, contenitori di tuple possono essere ordinati .

Original:

Because operator< is defined for tuples, containers of tuples can be sorted.

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#include <iostream>
#include <tuple>
#include <vector>
#include <algorithm>
int main()
{
    std::vector<std::tuple<int, std::string, float>> v;
    v.emplace_back(2, "baz", -0.1);
    v.emplace_back(2, "bar", 3.14);
    v.emplace_back(1, "foo", 100.1);
    std::sort(v.begin(), v.end());

    for(auto p: v) {
        std::cout << "(" << std::get<0>(p) << ", " << std::get<1>(p)
                  << ", " << std::get<2>(p) << ")