Avoid copying
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@ -40,7 +40,7 @@ SECTION("empty inner ring") {
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proc.add_path(path);
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REQUIRE(proc.polygon_.size() == 2);
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auto outer_ring = proc.polygon_.front();
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auto const& outer_ring = proc.polygon_.front();
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REQUIRE(outer_ring.size() == 5);
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CHECK(outer_ring[0].x == Approx(-1));
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