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    Static Assertion

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    Performs compile-time assertion checking
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    Inhaltsverzeichnis

    [Bearbeiten]Syntax

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

    [Bearbeiten]Erklärung

    • bool_constexpr einer Boolschen Konstante Ausdruck, der ausgewertet werden
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      bool_constexpr a boolean constant expression to be evaluated
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    • string Zeichenfolgenliteral, die als Compiler-Fehler, wenn bool_constexpr erscheint, ist falsch
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      string string literal that will appear as compiler error if bool_constexpr is false
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    [Bearbeiten]Beispiel

    #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}

    Possible output: 

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

    [Bearbeiten]Siehe auch

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