Add path iterator range constructor

2 files changed, 30 insertions, 1 deletions

diff --git a/butl/path b/butl/path
index 5462cc9..5f6d063 100644
--- a/butl/path
+++ b/butl/path
@@ -235,6 +235,8 @@ namespace butl
 
     typedef path_traits<C> traits;
 
+    struct iterator;
+
     // Construct special empty path. Note that we have to provide our
     // own implementation rather than using '=default' to make clang
     // allow default-initialized const instances of this type.
@@ -256,6 +258,11 @@ namespace butl
     basic_path (const string_type& s, size_type p, size_type n)
         : base_type (string_type (s, p, n)) {init ();}
 
+    // Create a path as a sub-path identified by the [begin, end)
+    // range of components.
+    //
+    basic_path (const iterator& begin, const iterator& end);
+
     void
     swap (basic_path& p)
     {
@@ -399,7 +406,7 @@ namespace butl
       }
 
       iterator
-      operator++ (int) {iterator r (*this); return ++r;}
+      operator++ (int) const {iterator r (*this); return ++r;}
 
       string_type operator* () const
       {
@@ -416,6 +423,8 @@ namespace butl
       operator!= (const iterator& x, const iterator& y) {return !(x == y);}
 
     private:
+      friend class basic_path;
+
       // b != npos && e == npos - last component
       // b == npos && e == npos - one past last component (end)
       //
diff --git a/butl/path.ixx b/butl/path.ixx
index 3e8a9cc..7ce8c63 100644
--- a/butl/path.ixx
+++ b/butl/path.ixx
@@ -147,6 +147,26 @@ namespace butl
   }
 
   template <typename C, typename K>
+  inline basic_path<C, K>::
+  basic_path (const iterator& b, const iterator& e)
+  {
+    //assert (b.p_ == e.p_);
+
+    if (b != e)
+    {
+      this->path_.assign (
+        *b.p_, b.b_, (e.b_ != string_type::npos ? e.b_ - b.b_ - 1 : e.b_));
+
+#ifndef _WIN32
+      if (this->path_.empty ())
+        this->path_ = '/';
+#endif
+
+      // No init() should be necessary.
+    }
+  }
+
+  template <typename C, typename K>
   inline basic_path<C, K>& basic_path<C, K>::
   complete ()
   {