Add stripiter

A generic iterator wrapper returning a tuple of 3 references to the original values, as
processed in the fashion of an OpenGL triangle strip.

1 files changed, 20 insertions, 0 deletions

diff --git a/test/test-lib.cpp b/test/test-lib.cpp
index 58b769a..5f0b5e5 100644
--- a/test/test-lib.cpp
+++ b/test/test-lib.cpp
@@ -4,6 +4,7 @@
 #include <boost/test/data/test_case.hpp>
 #include <boost/test/unit_test.hpp>
 
+#include <collections.h>
 #include <glArrays.h>
 #include <glad/gl.h>
 #include <set>
@@ -49,3 +50,22 @@ BOOST_AUTO_TEST_CASE(generate_move_and_delete)
 	}
 	BOOST_CHECK(active.empty());
 }
+
+constexpr std::array TRIANGLE_STRIP_IN {0, 1, 2, 3, 4, 5};
+static_assert(std::distance(strip_begin(TRIANGLE_STRIP_IN), strip_end(TRIANGLE_STRIP_IN)) == 4);
+
+BOOST_AUTO_TEST_CASE(triangle_strip_iter)
+{
+	constexpr std::array TRIANGLE_STRIP_EXPECTED {0, 1, 2, 2, 1, 3, 2, 3, 4, 4, 3, 5};
+
+	std::vector<int> out;
+	std::for_each(strip_begin(TRIANGLE_STRIP_IN), strip_end(TRIANGLE_STRIP_IN), [&out](const auto & t) {
+		const auto [a, b, c] = t;
+		out.push_back(a);
+		out.push_back(b);
+		out.push_back(c);
+	});
+	BOOST_REQUIRE_EQUAL(out.size(), (TRIANGLE_STRIP_IN.size() - 2) * 3);
+	BOOST_CHECK_EQUAL_COLLECTIONS(
+			out.begin(), out.end(), TRIANGLE_STRIP_EXPECTED.begin(), TRIANGLE_STRIP_EXPECTED.end());
+}