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Type alias (seit C++11)

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Allgemeine Themen
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General topics
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Flusskontrolle
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Flow control
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Bedingte Ausführung Aussagen
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Conditional execution statements
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Iterationsanweisungen
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Iteration statements
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Gehe Aussagen
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Jump statements
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Funktionen
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Functions
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Funktion Erklärung
Lambda-Funktion Erklärung
Funktions-Template
inline-Spezifizierer
Exception-Spezifikationen (veraltet)
noexcept Spezifizierer (C++11)
Ausnahmen
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Exceptions
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Namespaces
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Namespaces
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Types
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Types
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decltype specifier (C++11)
Specifiers
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Specifiers
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cv Planer
Lagerdauer Planer
constexpr Spezifizierer (C++11)
auto Spezifizierer (C++11)
alignas Spezifizierer (C++11)
Initialisierung
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Initialization
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Literale
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Literals
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Expressions
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Expressions
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alternative Darstellungen
Utilities
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Utilities
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Types
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Types
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typedef declaration
Typ Aliasdeklaration (C++11)
Attribute (C++11)
Wirft
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Casts
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impliziten Konvertierungen
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
C-Stil und funktionale Besetzung
Speicherzuweisung
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Memory allocation
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Classes
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Classes
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Class-spezifische Funktion Eigenschaften
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Class-specific function properties
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explizit (C++11)
statisch
Besondere Member-Funktionen
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Special member functions
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Templates
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Templates
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Klassen-Template
Funktions-Template
Template-Spezialisierung
Parameter Packs (C++11)
Verschiedenes
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Miscellaneous
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Inline Montage
 
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);