Type alias (seit C++11)
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Typ-Aliasnamen ähneln typedefs, haben jedoch den Vorteil, mit Schablonen .
Original:
Type aliases are similar to typedefs, however, have the advantage of working with templates.
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[Bearbeiten] Syntax
| using identifier = type_name; | |||||||||
[Bearbeiten] Beispiele
using flags = std::ios_base::fmtflags; using func = void (*) (int,int); // typedef std::ios_base::fmtflags flags; // typedef void (*func)(int, int); template<class T> using ptr = T*; ptr<int> x; template<class T> using vec = std::vector<T>; vec<float> w; // type alias used to hide some template parameter template<class CharT> using mystring = std::basic_string<CharT,std::char_traits<CharT>>; mystring<char> str; // type alias used to simplify the syntax of std::enable_if template< class Condition > using EnableIf = Invoke<std::enable_if<Condition::value>>; template <typename T, typename = EnableIf<std::is_polymorphic<T>>> int f(T t);
