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Implementation defined behavior control

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C++
 
Linguagem C++
Tópicos gerais
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General topics
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Controle de fluxo
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Flow control
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Declarações execução condicional
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Conditional execution statements
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Instruções de iteração
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Iteration statements
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Ir declarações
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Jump statements
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Funções
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Functions
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declaração da função
lambda declaração da função
modelo de função
linha especificador
especificações de exceção (obsoleta)
noexcept especificador (C++11)
Exceções
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Exceptions
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Namespaces
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Namespaces
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Tipos
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Types
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decltype specifier (C++11)
Especificadores
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Specifiers
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cv especificadores
armazenamento duração especificadores
constexpr especificador (C++11)
auto especificador (C++11)
alignas especificador (C++11)
Inicialização
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Initialization
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Literais
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Literals
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Expressões
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Expressions
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representações alternativas
Utilitários
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Utilities
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Tipos
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Types
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typedef declaration
tipo de alias declaração (C++11)
atributos (C++11)
Conversões
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Casts
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conversões implícitas
const_cast conversion
static_cast conversion
dynamic_cast conversion
reinterpret_cast conversion
Elenco C-estilo e funcional
Alocação de memória
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Memory allocation
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Classes
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Classes
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Classe propriedades específicas de função
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Class-specific function properties
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Funções membro especiais
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Special member functions
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Modelos
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Templates
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modelo de classe
modelo de função
especialização de modelo
pacotes de parâmetros (C++11)
Diversos
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Miscellaneous
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Assembly embutido
 
Preprocessor
 
Comportamento aplicação definida é controlada pela directiva #pragma.
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Implementation defined behavior is controlled by #pragma directive.
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Índice

[editar] Sintaxe

#pragma pragma_params

[editar] Explicação

Diretiva pragma controla aplicação específica comportamento do compilador, como desabilitar os avisos do compilador ou alterar os requisitos de alinhamento. Qualquer pragma que não é reconhecida é ignorado.
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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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[editar] Pragmas padrão

Os três seguintes pragmas são definidas pela norma idioma:
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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)
onde arg é ou ON ou OFF ou DEFAULT.
Original:
where arg is either ON or OFF or DEFAULT.
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1)
Se definido para ON, informa o compilador que o programa vai acessar ou modificar de ponto flutuante ambiente, o que significa que as otimizações que poderia subverter testes bandeira e mudanças de modo (por exemplo, a eliminação subexpressão comum global, o movimento de código, e dobrar constante) são proibidos. O valor padrão é definida pela implementação, geralmente OFF.
Original:
If set to ON, informs the compiler that the program will access or modify de ponto flutuante 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' contratação de ponto-flutuante expressões, que é otimizações que omitem erros de arredondamento e de ponto flutuante exceções que seriam observadas se a expressão foi avaliada exatamente como está escrito. O valor padrão é definida pela implementação, geralmente 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 o compilador que a multiplicação, divisão e valor absoluto de números complexos podem usar fórmulas matemáticas simplificadas, apesar da possibilidade de estouro intermediário. O intervalo dos valores passados ​​para aqueles função espera-se que seja limitado. O valor padrão é 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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[editar] Links externos

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