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xo-arena: + DArenaHashMap::operator[] + utest

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This commit is contained in:
Roland Conybeare 2026-01-15 19:36:31 -05:00
commit 563f6b3ea4
3 changed files with 96 additions and 7 deletions
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48
xo-arena/utest/DArenaHashMap.test.cpp
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@ -226,6 +226,54 @@ namespace xo {
}
}
TEST_CASE("DArenaHashMap-operator-bracket", "[arena][DArenaHashMap]")
{
using HashMap = DArenaHashMap<int, int>;
HashMap map;
// insert via operator[]
map[1] = 100;
map[2] = 200;
map[3] = 300;
REQUIRE(map.size() == 3);
// read back via operator[]
REQUIRE(map[1] == 100);
REQUIRE(map[2] == 200);
REQUIRE(map[3] == 300);
// update via operator[]
map[2] = 250;
REQUIRE(map[2] == 250);
REQUIRE(map.size() == 3); // size unchanged
// verify via find
{
auto it = map.find(1);
REQUIRE(it != map.end());
REQUIRE(it->second == 100);
}
{
auto it = map.find(2);
REQUIRE(it != map.end());
REQUIRE(it->second == 250);
}
{
auto it = map.find(3);
REQUIRE(it != map.end());
REQUIRE(it->second == 300);
}
// operator[] on non-existent key creates default entry
int & val = map[999];
REQUIRE(map.size() == 4);
REQUIRE(val == 0); // default-initialized
val = 999;
REQUIRE(map[999] == 999);
}
// TODO:
// - let's try getting lcov to work in xo-umbrella2
}