Track prerequisite packages, handle in pkg-{con,dis}figure

1 files changed, 39 insertions, 0 deletions

diff --git a/bpkg/satisfaction b/bpkg/satisfaction
new file mode 100644
index 0000000..2200688
--- /dev/null
+++ b/bpkg/satisfaction
@@ -0,0 +1,39 @@
+// file      : bpkg/satisfaction -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef BPKG_SATISFACTION
+#define BPKG_SATISFACTION
+
+#include <bpkg/types>
+#include <bpkg/package>
+#include <bpkg/utility>
+
+namespace bpkg
+{
+  // Return true if version satisfies the constraint.
+  //
+  bool
+  satisfies (const version&, const dependency_constraint&);
+
+  inline bool
+  satisfies (const version& v, const optional<dependency_constraint>& c)
+  {
+    return !c || satisfies (v, *c);
+  }
+
+  // Return true if any version that satisfies l also satisfies r, or, in
+  // other words, l is stricter than or equal to r.
+  //
+  bool
+  satisfies (const dependency_constraint& l, const dependency_constraint& r);
+
+  inline bool
+  satisfies (const optional<dependency_constraint>& l,
+             const optional<dependency_constraint>& r)
+  {
+    return l ? (!r || satisfies (*l, *r)) : !r;
+  }
+}
+
+#endif // BPKG_SATISFACTION