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+// file : libbuild2/target-state.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUILD2_TARGET_STATE_HXX
+#define LIBBUILD2_TARGET_STATE_HXX
+
+#include <libbuild2/types.hxx>
+#include <libbuild2/utility.hxx>
+
+#include <libbuild2/export.hxx>
+
+namespace build2
+{
+ // The order of the enumerators is arranged so that their integral values
+ // indicate whether one "overrides" the other in the "merge" operator|
+ // (see below).
+ //
+ // Note that postponed is "greater" than unchanged since it may result in
+ // the changed state.
+ //
+ enum class target_state: uint8_t
+ {
+ unknown,
+ unchanged,
+ postponed,
+ busy,
+ changed,
+ failed,
+ group // Target's state is the group's state.
+ };
+
+ inline target_state&
+ operator |= (target_state& l, target_state r)
+ {
+ if (static_cast<uint8_t> (r) > static_cast<uint8_t> (l))
+ l = r;
+
+ return l;
+ }
+
+ LIBBUILD2_SYMEXPORT ostream&
+ operator<< (ostream&, target_state); // target.cxx
+}
+
+#endif // LIBBUILD2_TARGET_STATE_HXX