Implementation defined behavior control
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Comportement dfini par l'implmentation est contrl par la directive
#pragma .Original:
Implementation defined behavior is controlled by
#pragma directive.The text has been machine-translated via Google Translate.
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Syntaxe
#pragma pragma_params
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Explication
Directive Pragma contrle spcifique l'implmentation comportement du compilateur, telles que la dsactivation des avertissements du compilateur ou de l'volution des besoins d'alignement. Toute pragma qui n'est pas reconnu est ignor .
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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Pragmas standard
Les trois suivantes pragmas sont dfinis par la norme langue:
Original:
The following three pragmas are defined by the language standard:
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#pragma STDC FENV_ACCESS arg
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(1) | ||||||||
#pragma STDC FP_CONTRACT arg
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(2) | ||||||||
#pragma STDC CX_LIMITED_RANGE arg
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(3) | ||||||||
o arg est soit
ON ou OFF ou DEFAULT . Original:
where arg is either
ON or OFF or DEFAULT. The text has been machine-translated via Google Translate.
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1)
S'il est rgl sur
ON, signale au compilateur que le programme peut accder ou modifier virgule flottante environnement, ce qui signifie que les optimisations qui pourraient subvertir les tests du pavillon et changement de mode (par exemple, l 'limination de sous-expressions communes, dplacement de code et constantes) sont interdits. La valeur par dfaut est dfinie par l'implmentation, gnralement OFF .Original:
If set to
ON, informs the compiler that the program will access or modify virgule flottante environnement, 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.The text has been machine-translated via Google Translate.
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2)
Permet' traitance des expressions en virgule flottante, c'est-optimisations qui omettent des erreurs d'arrondi en virgule flottante et les exceptions qui seraient observs si l'expression a t value exactement comme crit. La valeur par dfaut est dfinie par l'implmentation, gnralement
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.The text has been machine-translated via Google Translate.
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3)
Informe le compilateur que la multiplication, la division, et la valeur absolue des nombres complexes peuvent utiliser des formules mathmatiques simplifis, en dpit de la possibilit de dbordement intermdiaire. La gamme des valeurs transmises ceux de fonction devrait tre limite. La valeur par dfaut est
OFFOriginal:
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
OFFThe text has been machine-translated via Google Translate.
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Liens externes
- C++ pragmas in Visual Studio 2010
- Pragmas accepte par GCC 4.6.2Original:Pragmas accepted by GCC 4.6.2The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - General Purpose Pragmas in IBM AIX XL C/C++ V7.0
- Appendix B. Pragmas Sun Studio 11 C + + Guide de l'utilisateur deOriginal:Appendix B. Pragmas in Sun Studio 11 C++ User's GuideThe text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions. - Intel C++ compiler pragmas