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103 return Arc(e, d); |
103 return Arc(e, d); |
104 } |
104 } |
105 |
105 |
106 /// Returns whether the given directed arc has the same orientation |
106 /// Returns whether the given directed arc has the same orientation |
107 /// as the corresponding edge. |
107 /// as the corresponding edge. |
108 /// |
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109 /// \todo reference to the corresponding point of the undirected digraph |
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110 /// concept. "What does the direction of an edge mean?" |
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111 static bool direction(const Arc &a) { return a.forward; } |
108 static bool direction(const Arc &a) { return a.forward; } |
112 |
109 |
113 using Parent::first; |
110 using Parent::first; |
114 using Parent::next; |
111 using Parent::next; |
115 |
112 |