Implementation defined behavior control

 

C++

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Lenguaje C++

Los temas generales Original: General topics The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Preprocessor Comentarios Palabras clave	Tabla ASCII Las secuencias de escape Historia de C++
Control de flujo Original: Flow control The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Sentencias condicionales ejecución Original: Conditional execution statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
if statement	switch statement
Instrucciones de iteración Original: Iteration statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
for loop range-for loop (C++11)	while loop do-while loop
Ir declaraciones Original: Jump statements The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
continue statement break statement	goto statement return statement
Funciones Original: Functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
declaración de la función
lambda declaración de la función
función de plantilla
especificador inline
especificaciones de excepción (obsoleto)
noexcept especificador (C++11)
Excepciones Original: Exceptions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
tirar expresión	bloque try-catch
Los espacios de nombres Original: Namespaces The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
espacio de nombres declaración	alias de espacios de nombres
Tipos Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
tipos fundamentales tipos de compuestos los tipos de enumeración	tipos de unión tipos de funciones
decltype specifier (C++11)
Los especificadores Original: Specifiers The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
cv especificadores
almacenamiento duración especificadores
constexpr especificador (C++11)
auto especificador (C++11)
alignas especificador (C++11)
Inicialización Original: Initialization The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
predeterminado de inicialización valor de inicialización cero de inicialización copiar inicialización inicialización directa	inicialización de agregados lista de inicialización (C++11) inicialización constante referencia de inicialización

Los literales Original: Literals The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
literales enteros Los literales de caracteres Los literales de punto flotante literales de cadena	Los literales booleanos nullptr (C++11) definido por el usuario (C++11)
Expresiones Original: Expressions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
categorías de valor orden de evaluación	los operadores prioridad de los operadores
representaciones alternativas
Utilidades Original: Utilities The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Tipos Original: Types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
typedef declaration
alias de tipo de declaración (C++11)
atributos (C++11)
Lanza Original: Casts The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
conversiones implícitas
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
C-cast estilo y funcional
De asignación de memoria Original: Memory allocation The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
new expression	delete expression
Clases Original: Classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
clase de declaración this pointer acceder a los especificadores	amigo especificador listas de inicializadores
Clase propiedades específicas de la función Original: Class-specific function properties The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
función virtual anular especificador (C++11) último especificador (C++11)	explícita (C++11) estático
Funciones especiales miembro Original: Special member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
default constructor copiar constructor mover constructor (C++11)	copiar asignación mover asignación (C++11) destructor
Plantillas Original: Templates The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
clase de plantilla
función de plantilla
plantilla de especialización
paquetes de parámetros (C++11)
Varios Original: Miscellaneous The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.
Montaje en línea

 

Preprocessor

#if #ifdef #ifndef #else #elif #endif

#define #undef #,## operators

#include

#warning

#error

#pragma

#line

 

Implementación define el comportamiento es controlado por la directiva #pragma .

Original:

Implementation defined behavior is controlled by #pragma directive.

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Sintaxis

#pragma pragma_params

Explicación

Directiva Pragma controla el comportamiento específico de la implementación del compilador, por ejemplo, deshabilitar las advertencias del compilador o el cambio de los requisitos de alineación. Cualquier pragma que no se reconoce es ignorado .

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 estándar

Los siguientes tres pragmas están definidos por el estándar del lenguaje:

Original:

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)

donde arg es o bien ON o OFF o DEFAULT .

Original:

where arg is either ON or OFF or DEFAULT.

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1)

Si se establece en ON, informa al compilador que el programa podrá acceder ni modificar de punto flotante de medio ambiente, lo que significa que las optimizaciones que pueden subvertir las pruebas de la bandera y los cambios de modo (por ejemplo, la eliminación de subexpresiones comunes globales, el movimiento de código y plegado constante) están prohibidos. El valor predeterminado está definido por la implantación, por lo general OFF .

Original:

If set to ON, informs the compiler that the program will access or modify de punto flotante de medio ambiente, 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)

Permite' contratación de expresiones de coma flotante, es decir optimizaciones que omiten los errores de redondeo y excepciones de punto flotante que se observarían si la expresión se evalúa exactamente como está escrito. El valor predeterminado está definido por la implantación, por lo general 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)

Informa al compilador que la multiplicación, la división, y el valor absoluto de los números complejos pueden utilizar fórmulas matemáticas simplificadas, a pesar de la posibilidad de desbordamiento intermedio. El rango de los valores pasados ​​a aquellos función se espera que sea limitado. El valor por defecto es 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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Enlaces externos

• C++ pragmas in Visual Studio 2010
• Pragmas aceptado por GCC 4.6.2

  Original:

  Pragmas accepted by GCC 4.6.2

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• General Purpose Pragmas in IBM AIX XL C/C++ V7.0
• Appendix B. Pragmas en Sun Studio 11 C + + Guía del usuario de

  Original:

  Appendix B. Pragmas in Sun Studio 11 C++ User's Guide

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• Intel C++ compiler pragmas