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+/* vim: set sw=4 sts=4 et foldmethod=syntax : */
+
+/*
+ * Copyright (c) 2005, 2006 Ciaran McCreesh <ciaranm@ciaranm.org>
+ *
+ * This file is part of the Paludis package manager. Paludis is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU General
+ * Public License version 2, as published by the Free Software Foundation.
+ *
+ * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#ifndef PALUDIS_GUARD_PALUDIS_VERSION_OPERATOR_HH
+#define PALUDIS_GUARD_PALUDIS_VERSION_OPERATOR_HH 1
+
+#include <paludis/util/instantiation_policy.hh>
+#include <paludis/util/validated.hh>
+
+#include <string>
+#include <iosfwd>
+
+/** \file
+ * Declarations for the VersionOperator class.
+ *
+ * \ingroup grpversions
+ */
+
+namespace paludis
+{
+ class VersionSpec;
+
+ /**
+ * Represents an operator attached to a VersionSpec.
+ *
+ * \ingroup grpversions
+ */
+ enum VersionOperatorValue
+ {
+ vo_less_equal, ///< <= dependency
+ vo_less, ///< < dependency
+ vo_equal, ///< = dependency
+ vo_tilde, ///< ~ dependency
+ vo_greater, ///< > dependency
+ vo_greater_equal, ///< >= dependency
+ vo_equal_star, ///< =* dependency
+ last_vo ///< number of items
+ };
+
+ /**
+ * An operator attached to a VersionSpec, validated.
+ *
+ * \ingroup grpversions
+ */
+ class VersionOperator : public ComparisonPolicy<VersionOperator,
+ comparison_mode::EqualityComparisonTag,
+ comparison_method::CompareByMemberTag<VersionOperatorValue> >
+ {
+ friend std::ostream & operator<< (std::ostream &, const VersionOperator &);
+
+ private:
+ static VersionOperatorValue _decode(const std::string & v);
+
+ VersionOperatorValue _v;
+
+ public:
+ /**
+ * Constructor.
+ */
+ VersionOperator(const VersionOperatorValue v) :
+ ComparisonPolicyType(&VersionOperator::_v),
+ _v(v)
+ {
+ }
+
+ /**
+ * Copy constructor.
+ */
+ VersionOperator(const VersionOperator & other) :
+ ComparisonPolicyType(other),
+ _v(other._v)
+ {
+ }
+
+ /**
+ * Constructor, from a string.
+ */
+ VersionOperator(const std::string & v) :
+ ComparisonPolicyType(&VersionOperator::_v),
+ _v(_decode(v))
+ {
+ }
+
+ /**
+ * Assignment.
+ */
+ const VersionOperator & operator= (const VersionOperator & other)
+ {
+ _v = other._v;
+ return *this;
+ }
+
+ /**
+ * Return value.
+ */
+ VersionOperatorValue value() const
+ {
+ return _v;
+ }
+
+ /**
+ * Return a pointer to member operator for VersionSpec that
+ * corresponds to a particular operator.
+ */
+ bool (VersionSpec::* as_version_spec_operator() const)(const VersionSpec &) const;
+ };
+
+ /**
+ * Thrown if a bad version operator is encountered.
+ *
+ * \ingroup grpversions
+ * \ingroup grpexceptions
+ */
+ class BadVersionOperatorError :
+ public Exception
+ {
+ public:
+ /**
+ * Constructor.
+ */
+ BadVersionOperatorError(const std::string & msg) throw ();
+ };
+
+ /**
+ * A VersionOperator can be written to an ostream.
+ *
+ * \ingroup grpversions
+ */
+ std::ostream & operator<< (std::ostream & s, const VersionOperator &);
+}
+
+#endif