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Implementation defined behavior control

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Sprache C + +
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
 
 
Implementierung definiert Verhalten wird durch #pragma Richtlinie gesteuert .
Original:
Implementation defined behavior is controlled by #pragma directive.
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Inhaltsverzeichnis

[Bearbeiten] Syntax

#pragma pragma_params

[Bearbeiten] Erklärung

Pragma-Direktive steuert die Implementierung spezifischer Verhalten des Compilers, wie das Deaktivieren Compiler-Warnungen oder das Ändern der Ausrichtung Anforderungen. Jede pragma, die nicht erkannt wird, wird ignoriert .
Original:
Pragma directive controls implementation-specific behavior of the compiler, such as disabling compiler warnings or changing alignment requirements. Any pragma that is not recognized is ignored.
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[Bearbeiten] Standard Pragmas

Die folgenden drei Pragmas werden durch die Sprache Standard definiert:
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The following three pragmas are defined by the language standard:
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#pragma STDC FENV_ACCESS arg (1)
#pragma STDC FP_CONTRACT arg (2)
#pragma STDC CX_LIMITED_RANGE arg (3)
wo arg entweder ON oder OFF oder DEFAULT .
Original:
where arg is either ON or OFF or DEFAULT.
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1)
Wenn die ON gesetzt, informiert der Compiler, dass das Programm zugreifen oder diese ändern Floating-Point-Umgebung, was bedeutet, dass Optimierungen, die Flagge Tests und wechselt (zB Beseitigung globaler gemeinsamer Teilausdrücke, code Bewegung und konstante Faltung) untergraben könnte verboten werden bedeutet. Der Standardwert ist die Implementierung definiert, in der Regel OFF .
Original:
If set to ON, informs the compiler that the program will access or modify Floating-Point-Umgebung, which means that optimizations that could subvert flag tests and mode changes (e.g., global common subexpression elimination, code motion, and constant folding) are prohibited. The default value is implementation-defined, usually OFF.
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2)
Ermöglicht Contracting der Floating-Point-Ausdrücke, die Optimierungen, die Rundungsfehler und Gleitkomma-Ausnahmen, die auftreten, wenn der Ausdruck genau so geschrieben wurde ausgewertet würden weglassen ist. Der Standardwert ist die Implementierung definiert, in der Regel ON .
Original:
Allows contracting of floating-point expressions, that is optimizations that omit rounding errors and floating-point exceptions that would be observed if the expression was evaluated exactly as written. The default value is implementation-defined, usually ON.
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3)
Informiert den Compiler, dass Multiplikation, Division, und dem absoluten Wert der komplexen Zahlen kann vereinfacht mathematische Formeln zu verwenden, trotz der Möglichkeit von Zwischen-Überlauf. Der Bereich der Werte, die an jene Funktion soll begrenzt werden. Der Standardwert ist OFF
Original:
Informs the compiler that multiplication, division, and absolute value of complex numbers may use simplified mathematical formulas, despite the possibility of intermediate overflow. The range of the values passed to those function is expected to be limited. The default value is OFF
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[Bearbeiten] Externer Links