| Macro SEQAN_CTOR_DISABLE_IF Bind the visibility of a constructor to an expression. SEQAN_CTOR_DISABLE_IF(cond) Include Headers seqan/basic.h Parameters
cond | Boolean type. If False or a metafunction that returns False, the following function is visible, otherwise not. Remarks: The boolean value must be available at compile-time, e.g. sizeof(T)>4.
Remarks This macro allows to bind the visibility of a constructor to a boolean expression by using the SFINAE principle for an optional argument with default value. It can be used as the last dummy-argument of a constructor. To avoid an unused argument warning, call ignoreUnusedVariableWarning(dummy) in the constructor's body. Examples String(T const & s, SEQAN_CTOR_DISABLE_IF(IsProxy<T> >)) : // macro must be extra c'tor argument str(s) { ignoreUnusedVariableWarning(dummy); // necessary to avoid unused warning } SeqAn - Sequence Analysis Library - www.seqan.de

Page built @2014/10/13 16:12:59