operator==,!=,<,<=,>,>=(std::tuple)
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<tbody> </tbody>| definiert in Header <tuple>
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template< class... TTypes, class... UTypes > bool operator==( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs ); |
(1) | (seit C++11) |
template< class... TTypes, class... UTypes > bool operator!=( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs ); |
(2) | (seit C++11) |
template< class... TTypes, class... UTypes > bool operator<( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs ); |
(3) | (seit C++11) |
template< class... TTypes, class... UTypes > bool operator<=( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs ); |
(5) | (seit C++11) |
template< class... TTypes, class... UTypes > bool operator>( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs ); |
(4) | (seit C++11) |
template< class... TTypes, class... UTypes > bool operator>=( const tuple<TTypes...>& lhs, const tuple<UTypes...>& rhs ); |
(6) | (seit C++11) |
1-2)
Vergleicht jedes Element des Tupels
lhs mit dem entsprechenden Element des Tupels rhs .Original:
Compares every element of the tuple
lhs with the corresponding element of the tuple rhs.The text has been machine-translated via Google Translate.
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3-6)
Vergleicht und
lhs rhs lexikographisch, dh vergleicht die ersten Elemente, wenn sie quivalent sind, vergleicht die zweiten Elemente, wenn diejenigen quivalent sind, vergleicht die dritten Elemente und so weiter .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.The text has been machine-translated via Google Translate.
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Alle Vergleichsoperatoren kurzgeschlossen sind, sie greifen nicht auf Tupel-Elemente jenseits, was notwendig ist, um das Ergebnis des Vergleichs zu ermitteln .
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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Parameter
| lhs, rhs | - | Tupeln zu vergleichen
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. |
Rckgabewert
1)
true wenn std::get<i>(lhs) == std::get<i>(rhs) fr alle i in [0, sizeof...(Types)), sonst false. Fr zwei leere Tupel kehrt 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.The text has been machine-translated via Google Translate.
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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), wo lhstail ist lhs ohne seine erste Element, und rhstail ist rhs ohne dessen erstes Element. Fr zwei leere Tupel, kehrt 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.The text has been machine-translated via Google Translate.
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4) !(lhs < rhs)
5) rhs < lhs
6) !(rhs < lhs)
Beispiel
Da operator <fr Tupel definiert ist, knnen Container von Tupeln sortiert werden .
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) << ")\n";
}
}
Output:
(1, foo, 100.1)
(2, bar, 3.14)
(2, baz, -0.1)