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      Static Assertion

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      Índice

      [editar]Sintaxe

      static_assert(bool_constexpr,string)(desde C++11)

      [editar]Explicação

      • bool_constexpr uma expressão booleana constante a ser avaliada
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        bool_constexpr a boolean constant expression to be evaluated
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      • string seqüência literal que aparecerá como erro do compilador se bool_constexpr é falsa
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        string string literal that will appear as compiler error if bool_constexpr is false
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      [editar]Exemplo

      #include <type_traits>   template<class T>void swap( T& a, T& b){ static_assert(std::is_copy_constructible<T>::value, "Swap requires copying");   auto c = b; b = a; a = c;}   template<class T>struct data_structure { static_assert(std::is_default_constructible<T>::value, "Data Structure requires default-constructible elements");   };   struct no_copy { no_copy (const no_copy&)= delete; no_copy ()=default;};   struct no_default { no_default ()= delete;};   int main(){int a, b; swap(a,b);   no_copy nc_a, nc_b; swap(nc_a,nc_b);// 1   data_structure<int> ds_ok; data_structure<no_default> ds_error;// 2}

      Potencial saída: 

      1: error: static assertion failed: Swap requires copying 2: error: static assertion failed: Data Structure requires default-constructible elements

      [editar]Veja também

      Obtida de "https://pt.cppreference.com/mwiki/index.php?title=cpp/language/static_assert&oldid=20958"
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