From f6ff54c492df81018cf48da039ee681508f88e46 Mon Sep 17 00:00:00 2001 From: Adrian Kummerlaender Date: Sat, 16 Aug 2014 23:30:36 +0200 Subject: Implemented primitive optional parameter support for external functions * renamed FunctionExternalTextFormatter into FunctionExternalCommand ** the goal is to provide a general interface to a variety of external commands *** e.g. not just text formatters but system utilities for file management and so on ** this requires the stdin parameter to be optional as not all external commands require stdin input * implemented "filter_derived" helper template to determine amount of optional parameters ** optional parameters are defined as "boost::optional" specializations *** they in turn can be detected by checking if "boost::optional_detail::optional_tag" is a base class * "callConstructDocument" member method of "FunctionBase" performs additional bounds checking of parameter vector * "boost::optional" specific member overload was added to "XObjectValue" helper class ** we will have to provide full specializations for all optional types as C++ prohibits partial member function template specialization * renamed the external function in "PlattformGuard" * changed README.md and test cases accordingly --- src/support/type/filter.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 src/support/type/filter.h (limited to 'src/support/type/filter.h') diff --git a/src/support/type/filter.h b/src/support/type/filter.h new file mode 100644 index 0000000..4a0e19f --- /dev/null +++ b/src/support/type/filter.h @@ -0,0 +1,24 @@ +#ifndef INPUTXSLT_SRC_SUPPORT_TYPE_FILTER_H_ +#define INPUTXSLT_SRC_SUPPORT_TYPE_FILTER_H_ + +#include +#include + +namespace InputXSLT { + +template < + typename BaseReference, + typename Head, + typename... Tail +> +struct filter_derived { + typedef typename std::conditional< + std::is_base_of::value, + std::tuple, + std::tuple + >::type type; +}; + +} + +#endif // INPUTXSLT_SRC_SUPPORT_TYPE_FILTER_H_ -- cgit v1.2.3