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[bits] Add tests for return types

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With gcc <= 12, std::bit_width<T>() returns T, not int, so make sure the
absl:: equivalents return the correct type.

https://github.com/abseil/abseil-cpp/issues/1890

PiperOrigin-RevId: 760612745
Change-Id: Ibbbe6eaa1aab677ecd747cf40765f6443eefe628
This commit is contained in:
Jesse Rosenstock
2025-05-19 07:12:44 -07:00
committed by Copybara-Service
parent 41a1f434d4
commit fc0b7a083b
1 changed files with 21 additions and 0 deletions
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21
absl/numeric/bits_test.cc
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@@ -26,16 +26,37 @@ namespace absl {
ABSL_NAMESPACE_BEGIN
namespace {
template <typename IntT>
class UnsignedIntegerTypesTest : public ::testing::Test {};
template <typename IntT>
class IntegerTypesTest : public ::testing::Test {};
using UnsignedIntegerTypes =
::testing::Types<uint8_t, uint16_t, uint32_t, uint64_t>;
using OneByteIntegerTypes = ::testing::Types<
unsigned char,
uint8_t
>;
TYPED_TEST_SUITE(UnsignedIntegerTypesTest, UnsignedIntegerTypes);
TYPED_TEST_SUITE(IntegerTypesTest, OneByteIntegerTypes);
TYPED_TEST(UnsignedIntegerTypesTest, ReturnTypes) {
using UIntType = TypeParam;
static_assert(std::is_same_v<decltype(byteswap(UIntType{0})), UIntType>);
static_assert(std::is_same_v<decltype(rotl(UIntType{0}, 0)), UIntType>);
static_assert(std::is_same_v<decltype(rotr(UIntType{0}, 0)), UIntType>);
static_assert(std::is_same_v<decltype(countl_zero(UIntType{0})), int>);
static_assert(std::is_same_v<decltype(countl_one(UIntType{0})), int>);
static_assert(std::is_same_v<decltype(countr_zero(UIntType{0})), int>);
static_assert(std::is_same_v<decltype(countr_one(UIntType{0})), int>);
static_assert(std::is_same_v<decltype(popcount(UIntType{0})), int>);
static_assert(std::is_same_v<decltype(bit_ceil(UIntType{0})), UIntType>);
static_assert(std::is_same_v<decltype(bit_floor(UIntType{0})), UIntType>);
static_assert(std::is_same_v<decltype(bit_width(UIntType{0})), int>);
}
TYPED_TEST(IntegerTypesTest, HandlesTypes) {
using UIntType = TypeParam;