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[llvm][ADT] Add getSingleElement helper #131508

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Merged
matthias-springer merged 3 commits into from
Mar 16, 2025
Merged

[llvm][ADT] Add getSingleElement helper #131508

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78eca92
[llvm][ADT] Add `getSingleElement` helper
matthias-springer Mar 16, 2025
4b8b49a
add negative test
matthias-springer Mar 16, 2025
16933e5
guard death tests
matthias-springer Mar 16, 2025
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11 changes: 8 additions & 3 deletions llvm/unittests/ADT/STLExtrasTest.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1017,9 +1017,6 @@ TEST(STLExtrasTest, hasSingleElement) {
}

TEST(STLExtrasTest, getSingleElement) {
// Note: Asserting behavior of getSingleElement cannot be tested because the
// program would crash.

// Test const and non-const containers.
const std::vector<int> V1 = {7};
EXPECT_EQ(getSingleElement(V1), 7);
Expand All @@ -1043,6 +1040,14 @@ TEST(STLExtrasTest, getSingleElement) {
some_namespace::some_struct S;
S.data = V2;
EXPECT_EQ(getSingleElement(S), 8);

// Make sure that we crash on empty or too many elements.
SmallVector<int> V4;
EXPECT_DEATH(getSingleElement(V4), "expected container with single element");
SmallVector<int> V5{12, 13, 14};
EXPECT_DEATH(getSingleElement(V5), "expected container with single element");
std::list<int> L2;
EXPECT_DEATH(getSingleElement(L2), "expected container with single element");
}

TEST(STLExtrasTest, hasNItems) {
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