Union of ring and ring returns empty result. · Issue #1108 · boostorg/ geometry · GitHub
How can I use C++ boost geometry to create ring (donut) from two polgons? - Stack Overflow
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c++ - Strange behavious use boost::geometry::within() for polygon and ring - Stack Overflow
How can I use C++ boost geometry to create ring (donut) from two polgons? - Stack Overflow
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Union result goes around twice. · Issue #1109 · boostorg/geometry · GitHub
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