From 977d07a3ae47ef204665d1eda2d642e5064724f3 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Mon, 24 Jun 2019 12:01:19 +0200
Subject: Split build system into library and driver

---
 libbuild2/scope.ixx | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 libbuild2/scope.ixx

(limited to 'libbuild2/scope.ixx')

diff --git a/libbuild2/scope.ixx b/libbuild2/scope.ixx
new file mode 100644
index 0000000..3498ae0
--- /dev/null
+++ b/libbuild2/scope.ixx
@@ -0,0 +1,54 @@
+// file      : libbuild2/scope.ixx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+namespace build2
+{
+  // scope
+  //
+  inline scope* scope::
+  strong_scope ()
+  {
+    return root_ != nullptr
+      ? root_->strong_ != nullptr ? root_->strong_ : root_
+      : nullptr;
+  }
+
+  inline const scope* scope::
+  strong_scope () const
+  {
+    return root_ != nullptr
+      ? root_->strong_ != nullptr ? root_->strong_ : root_
+      : nullptr;
+  }
+
+  inline scope* scope::
+  weak_scope ()
+  {
+    scope* r (root_);
+    if (r != nullptr)
+      for (; r->parent_->root_ != nullptr; r = r->parent_->root_) ;
+    return r;
+  }
+
+  inline const scope* scope::
+  weak_scope () const
+  {
+    const scope* r (root_);
+    if (r != nullptr)
+      for (; r->parent_->root_ != nullptr; r = r->parent_->root_) ;
+    return r;
+  }
+
+  inline bool scope::
+  sub_root (const scope& r) const
+  {
+    // Scan the parent root scope chain looking for this scope.
+    //
+    for (const scope* pr (&r); (pr = pr->parent_->root_) != nullptr; )
+      if (pr == this)
+        return true;
+
+    return false;
+  }
+}
-- 
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