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User-defined literals (seit C++11)

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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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boolean Literale
nullptr (C++11)
benutzerdefiniert (C++11)
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
 
C + 11 wurde die Möglichkeit eingeführt, um benutzerdefinierte Suffixe Literale hinzufügen, um unterschiedliche Werte liefern .
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C++11 introduced the ability to add custom suffixes to literals in order to provide different values.
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Literal nachgestellte kann in einer Weise, ähnlich Betreiber überlastet werden .
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Literal suffixed can be overloaded in a way very similar to operators.
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[Bearbeiten] Syntax

return decl operator"" name ( unsigned long long n ) { body }
return decl operator"" name ( long double d ) { body }
return decl operator"" name ( char c ) { body }
return decl operator"" name ( const char* str, size_t sz ) { body }
return decl operator"" name ( const char* cstr ) { body }

[Bearbeiten] Erklärung

return -
Rückgabewert
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Return value
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decl -
Erklärung specifier Sequenz können Keywords als constexpr oder inline enthalten
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Declaration specifier sequence, can contain keywords as constexpr or inline
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name -
Eine gültige C + +-Kennung, die mit einem Unterstrich vorangestellt. Identifiers ohne Unterstrich sind reserviert für zukünftige Nutzung
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A valid C++ identifier, prefixed with an underscore. Identifiers without underscore are reserved for future use
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n -
Wert, der sich aus einer integralen Literal
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Value resulting from an integral literal
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d -
Wert, der sich aus einer Fließkomma-Literal
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Value resulting from a floating-point literal
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c -
Wert, der sich aus einer Zeichenliteral
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Value resulting from a character literal
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cstr -
Null-terminierter String durch den Compiler analysiert, für Integer-und Fließkomma-Literale
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Null-terminated string as parsed by the compiler, for integer and floating point literals
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str/sz -
Buffer und Größe aus einem Zeichenfolgenliteral
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Buffer and size from a string literal
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body -
Funktion Körper
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Function body
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[Bearbeiten] Beispiele

// used as conversion
inline constexpr long double operator"" _deg ( long double deg )
{
    return deg*3.141592/180;
}
...
double x = 90.0_deg; // x = 1.570796


// used with custom type
struct mytype
{
    ...
    mytype ( unsigned long long );
};
mytype operator"" _mytype ( unsigned long long n )
{
    return mytype(n);
}
...
mytype x = 123_mytype;


// used for side-effects
void operator"" _print ( const char* str )
{
    std::cout << str;
}
...
0x123ABC_print;

Output:

0x123ABC