User-defined literals (seit C++11)
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C + 11 wurde die Möglichkeit eingeführt, um benutzerdefinierte Suffixe Literale hinzufügen, um unterschiedliche Werte liefern .
Original:
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 .
Original:
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 }
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return decl operator"" name ( long double d ) { body }
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return decl operator"" name ( char c ) { body }
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return decl operator"" name ( const char* str, size_t sz ) { body }
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return decl operator"" name ( const char* cstr ) { body }
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[Bearbeiten] Erklärung
| return | - | Rückgabewert
Original: Return value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| decl | - | Erklärung specifier Sequenz können Keywords als constexpr oder inline enthalten
Original: Declaration specifier sequence, can contain keywords as constexpr or inline The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| name | - | Eine gültige C + +-Kennung, die mit einem Unterstrich vorangestellt. Identifiers ohne Unterstrich sind reserviert für zukünftige Nutzung
Original: A valid C++ identifier, prefixed with an underscore. Identifiers without underscore are reserved for future use The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| n | - | Wert, der sich aus einer integralen Literal
Original: Value resulting from an integral literal The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| d | - | Wert, der sich aus einer Fließkomma-Literal
Original: Value resulting from a floating-point literal The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| c | - | Wert, der sich aus einer Zeichenliteral
Original: Value resulting from a character literal The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| cstr | - | Null-terminierter String durch den Compiler analysiert, für Integer-und Fließkomma-Literale
Original: Null-terminated string as parsed by the compiler, for integer and floating point literals The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| str/sz | - | Buffer und Größe aus einem Zeichenfolgenliteral
Original: Buffer and size from a string literal The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| body | - | Funktion Körper
Original: Function body The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
[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
