From 452a26cefe3d9cdcf1670d1e8ed3037f11679f5e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Adam=20Wardy=C5=84ski?= <no@email>
Date: Mon, 8 Nov 2010 15:07:58 +0100
Subject: [PATCH] Predicate checking if two values are equal
---
libwccl/ops/equals.h | 62 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
create mode 100644 libwccl/ops/equals.h
diff --git a/libwccl/ops/equals.h b/libwccl/ops/equals.h
new file mode 100644
index 0000000..984e809
--- /dev/null
+++ b/libwccl/ops/equals.h
@@ -0,0 +1,62 @@
+#ifndef EQUALS_H
+#define EQUALS_H
+
+#include <boost/shared_ptr.hpp>
+#include <boost/mpl/list.hpp>
+#include <boost/mpl/assert.hpp>
+#include <boost/mpl/count.hpp>
+#include <libwccl/ops/predicate.h>
+#include <libwccl/ops/formatters.h>
+
+namespace Wccl {
+
+/**
+ * Predicate that checks for equality of values
+ */
+template <class T>
+class Equals : public Predicate {
+public:
+ typedef boost::shared_ptr<Function<T> > ArgFunctionPtr;
+
+ Equals(const ArgFunctionPtr& arg1_expr, const ArgFunctionPtr& arg2_expr)
+ : arg1_expr_(arg1_expr), arg2_expr_(arg2_expr)
+ {
+ BOOST_ASSERT(arg1_expr_);
+ BOOST_ASSERT(arg2_expr_);
+ }
+
+ virtual std::string to_string(const Corpus2::Tagset& tagset) const {
+ return BinaryFunctionFormatter::to_string(tagset, *this, *arg1_expr_, *arg2_expr_);
+ }
+
+ virtual std::string to_raw_string() const {
+ return BinaryFunctionFormatter::to_raw_string(*this, *arg1_expr_, *arg2_expr_);
+ }
+
+ virtual const std::string raw_operator_name() const {
+ return "equals";
+ }
+
+protected:
+ const ArgFunctionPtr arg1_expr_;
+ const ArgFunctionPtr arg2_expr_;
+
+ typedef FunctionBase::BaseRetValPtr BaseRetValPtr;
+
+ /**
+ * Take values of arguments from expressions and return True if they are equal,
+ * False otherwise.
+ */
+ virtual BaseRetValPtr apply_internal(const SentenceContext& context) const {
+ boost::shared_ptr<T> arg1 = this->arg1_expr_->apply(context);
+ boost::shared_ptr<T> arg2 = this->arg2_expr_->apply(context);
+ if(arg1->equals(*arg2)) {
+ return Predicate::True->apply(context);
+ }
+ return Predicate::False->apply(context);
+ }
+};
+
+} /* end ns Wccl */
+
+#endif // EQUALS_H
--
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