cpp/openttd-patchpack/source Changeset - r28635:e3d8752cbdad

Changeset - r28635:e3d8752cbdad

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Jonathan G Rennison - 3 months ago 2024-01-27 17:17:27
j.g.rennison@gmail.com

Codechange: Simplify SetBitIterator

Use FindFirstBit and KillFirstBit, allowing simpler iterator equality
Add simple test

3 files changed with 40 insertions and 4 deletions:

src/core/bitmath_func.hpp

src/tests/CMakeLists.txt

src/tests/bitmath_func.cpp

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src/core/bitmath_func.hpp

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@@ @@ -294,7 +294,7 @@ struct SetBitIterator { @@
 		bool operator==(const Iterator &other) const
+		{
-			return this->bitset == other.bitset && (this->bitset == 0 || this->bitpos == other.bitpos);
 			return this->bitset == other.bitset;
+		}
 		bool operator!=(const Iterator &other) const { return !(*this == other); }
 		Tbitpos operator*() const { return this->bitpos; }
@@ @@ -305,12 +305,14 @@ struct SetBitIterator { @@
 		Tbitpos bitpos;
 		void Validate()
+		{
 			while (this->bitset != 0 && (this->bitset & 1) == 0) this->Next();
 			if (this->bitset != 0) {
 				typename std::make_unsigned<Tbitset>::type unsigned_value = this->bitset;
 				this->bitpos = static_cast<Tbitpos>(FindFirstBit(unsigned_value));
+			}
+		}
 		void Next()
+		{
 			this->bitset = static_cast<Tbitset>(this->bitset >> 1);
 			this->bitpos++;
 			this->bitset = KillFirstBit(this->bitset);
+		}
 	};

src/tests/CMakeLists.txt

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 add_test_files(
     bitmath_func.cpp
     landscape_partial_pixel_z.cpp
     math_func.cpp
     mock_environment.h

src/tests/bitmath_func.cpp

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@@ new file 100644 @@
 /*
  * This file is part of OpenTTD.
  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 /** @file bitmath_func.cpp Test functionality from core/bitmath_func. */
 #include "../stdafx.h"
 #include "../3rdparty/catch2/catch.hpp"
 #include "../core/bitmath_func.hpp"
 TEST_CASE("SetBitIterator tests")
+{
 	auto test_case = [&](auto input, std::initializer_list<uint> expected) {
 		auto iter = expected.begin();
 		for (auto bit : SetBitIterator(input)) {
 			if (iter == expected.end()) return false;
 			if (bit != *iter) return false;
 			++iter;
+		}
 		return iter == expected.end();
 	};
 	CHECK(test_case(0, {}));
 	CHECK(test_case(1, { 0 }));
 	CHECK(test_case(42, { 1, 3, 5 }));
 	CHECK(test_case(0x8080FFFFU, { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 23, 31 }));
 	CHECK(test_case(INT32_MIN, { 31 }));
 	CHECK(test_case(INT64_MIN, { 63 }));
+}

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