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Codechange: Simplify SetBitIterator

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Use FindFirstBit and KillFirstBit, allowing simpler iterator equality
Add simple test
This commit is contained in:
Jonathan G Rennison
2024-01-27 17:17:27 +00:00
committed by rubidium42
parent dce7d5d9b0
commit c0b8e58404
3 changed files with 40 additions and 4 deletions
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1
src/tests/CMakeLists.txt
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@@ -1,4 +1,5 @@
add_test_files(
bitmath_func.cpp
landscape_partial_pixel_z.cpp
math_func.cpp
mock_environment.h

33
src/tests/bitmath_func.cpp Normal file
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@@ -0,0 +1,33 @@
/*
* 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 }));
}