From Jason Turner

[dcl.align]

C++11 → C++14 1.8 KB 21 lines
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Archived: C++11 | C++14
Markdown: C++11 | C++14
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  ### Alignment specifier <a id="dcl.align">[[dcl.align]]</a>
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  An *alignment-specifier* may be applied to a variable or to a class data
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  member, but it shall not be applied to a bit-field, a function
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- parameter, the formal parameter of a catch clause ([[except.handle]]),
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- or a variable declared with the `register` storage class specifier. An
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- *alignment-specifier* may also be applied to the declaration of a class
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- or enumeration type. An *alignment-specifier* with an ellipsis is a pack
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- expansion ([[temp.variadic]]).
 
 
 
 
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  When the *alignment-specifier* is of the form `alignas(`
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- *assignment-expression* `)`:
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- - the *assignment-expression* shall be an integral constant expression
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  - if the constant expression evaluates to a fundamental alignment, the
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  alignment requirement of the declared entity shall be the specified
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  fundamental alignment
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  - if the constant expression evaluates to an extended alignment and the
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  implementation supports that alignment in the context of the
 
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  ### Alignment specifier <a id="dcl.align">[[dcl.align]]</a>
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  An *alignment-specifier* may be applied to a variable or to a class data
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  member, but it shall not be applied to a bit-field, a function
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+ parameter, an *exception-declaration* ([[except.handle]]), or a
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+ variable declared with the `register` storage class specifier. An
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+ *alignment-specifier* may also be applied to the declaration or
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+ definition of a class (in an *elaborated-type-specifier* (
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+ [[dcl.type.elab]]) or *class-head* (Clause  [[class]]), respectively)
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+ and to the declaration or definition of an enumeration (in an
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+ *opaque-enum-declaration* or *enum-head*, respectively ([[dcl.enum]])).
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+ An *alignment-specifier* with an ellipsis is a pack expansion (
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+ [[temp.variadic]]).
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  When the *alignment-specifier* is of the form `alignas(`
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+ *constant-expression* `)`:
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+ - the *constant-expression* shall be an integral constant expression
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  - if the constant expression evaluates to a fundamental alignment, the
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  alignment requirement of the declared entity shall be the specified
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  fundamental alignment
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  - if the constant expression evaluates to an extended alignment and the
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  implementation supports that alignment in the context of the