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re-use evaluator object

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This commit is contained in:
artemp 2013-11-29 13:51:50 +00:00
parent a1c2bd0d86
commit 06592cedc3
1 changed files with 11 additions and 10 deletions
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21
include/mapnik/expression_evaluator.hpp
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@ -38,6 +38,7 @@
namespace mapnik
{
template <typename T0, typename T1>
struct evaluate : boost::static_visitor<T1>
{
@ -79,7 +80,7 @@ struct evaluate : boost::static_visitor<T1>
value_type operator() (global_attribute const& attr) const
{
return value_type();// shouldn't get here ? //attr.value<value_type,feature_type>(feature_);
return value_type();// shouldn't get here
}
value_type operator() (geometry_type_attribute const& geom) const
@ -89,22 +90,22 @@ struct evaluate : boost::static_visitor<T1>
value_type operator() (binary_node<tags::logical_and> const & x) const
{
return (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.left).to_bool())
&& (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.right).to_bool());
return (boost::apply_visitor(*this, x.left).to_bool())
&& (boost::apply_visitor(*this, x.right).to_bool());
}
value_type operator() (binary_node<tags::logical_or> const & x) const
{
return (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.left).to_bool())
|| (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.right).to_bool());
return (boost::apply_visitor(*this,x.left).to_bool())
|| (boost::apply_visitor(*this,x.right).to_bool());
}
template <typename Tag>
value_type operator() (binary_node<Tag> const& x) const
{
typename make_op<Tag>::type operation;
return operation(boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.left),
boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.right));
return operation(boost::apply_visitor(*this, x.left),
boost::apply_visitor(*this, x.right));
}
template <typename Tag>
@ -116,12 +117,12 @@ struct evaluate : boost::static_visitor<T1>
value_type operator() (unary_node<tags::logical_not> const& x) const
{
return ! (boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.expr).to_bool());
return ! (boost::apply_visitor(*this,x.expr).to_bool());
}
value_type operator() (regex_match_node const& x) const
{
value_type v = boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.expr);
value_type v = boost::apply_visitor(*this, x.expr);
#if defined(BOOST_REGEX_HAS_ICU)
return boost::u32regex_match(v.to_unicode(),x.pattern);
#else
@ -132,7 +133,7 @@ struct evaluate : boost::static_visitor<T1>
value_type operator() (regex_replace_node const& x) const
{
value_type v = boost::apply_visitor(evaluate<feature_type,value_type>(feature_),x.expr);
value_type v = boost::apply_visitor(*this, x.expr);
#if defined(BOOST_REGEX_HAS_ICU)
return boost::u32regex_replace(v.to_unicode(),x.pattern,x.format);
#else