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

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      < cpp‎ | utility‎ | tuple

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      C++
       
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      Os operadores relacionais
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      Relational operators
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      rel_ops::operator!=
      rel_ops::operator>
      rel_ops::operator<=
      rel_ops::operator>=
      Pares e tuplas
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      Pairs and tuples
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      Troque, avançar e avançar
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      Swap, forward and move
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      (C++11)
      (C++11)
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      std::tuple
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      Member functions
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      tuple::tuple
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      Non-member functions
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      operator=operator!=operator<operator<=operator>operator>=
      Classes auxiliares
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      Helper classes
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      Definido no cabeçalho <tuple>
      template<class... TTypes, class... UTypes>

      bool operator==(const tuple<TTypes...>& lhs,

                       const tuple<UTypes...>& rhs );
      		 (1) (desde C++11)
      template<class... TTypes, class... UTypes>

      bool operator!=(const tuple<TTypes...>& lhs,

                       const tuple<UTypes...>& rhs );
      		 (2) (desde C++11)
      template<class... TTypes, class... UTypes>

      bool operator<(const tuple<TTypes...>& lhs,

                      const tuple<UTypes...>& rhs );
      		 (3) (desde C++11)
      template<class... TTypes, class... UTypes>

      bool operator<=(const tuple<TTypes...>& lhs,

                       const tuple<UTypes...>& rhs );
      		 (5) (desde C++11)
      template<class... TTypes, class... UTypes>

      bool operator>(const tuple<TTypes...>& lhs,

                      const tuple<UTypes...>& rhs );
      		 (4) (desde C++11)
      template<class... TTypes, class... UTypes>

      bool operator>=(const tuple<TTypes...>& lhs,

                       const tuple<UTypes...>& rhs );
      		 (6) (desde C++11)
      1-2)
      Compara cada elemento do lhs tupla com o elemento correspondente do rhs tupla.
      Original:
      Compares every element of the tuple lhs with the corresponding element of the tuple rhs.
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      3-6)
      Compara lhs e rhs lexicographically, isto é, compara os primeiros elementos, se eles são equivalentes, compara os segundos elementos, se aqueles são equivalentes, compara os elementos terceiro, e assim por diante.
      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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      Todos os operadores de comparação são curto-circuito, pois eles não acessar elementos de tupla, para além do que é necessário para determinar o resultado da comparação.
      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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      Índice

      [editar]Parâmetros

      lhs, rhs -
      tuplas para comparar
      Original:
      tuples to compare
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      [editar]Valor de retorno

      1)
      true se std::get<i>(lhs)== std::get<i>(rhs) para todo i em [0, sizeof...(Types)), caso contrário false. Por dois retornos vazios tuplas 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), onde lhstail é lhs sem seu primeiro elemento, e rhstail é rhs sem seu primeiro elemento. Por duas tuplas vazias, retorna 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)

      [editar]Exemplo

      Porque <operador é definido para tuplas, recipientes de tuplas podem ser classificados .
      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";}}

      Saída: 

      (1, foo, 100.1) (2, bar, 3.14) (2, baz, -0.1)

      [editar]Veja também

      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/utility/tuple/operator_cmp&oldid=24776"
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