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authorGravatar Abseil Team <absl-team@google.com>2019-08-08 10:56:58 -0700
committerGravatar CJ Johnson <johnsoncj@google.com>2019-08-08 14:19:45 -0400
commitaa844899c937bde5d2b24f276b59997e5b668bde (patch)
treecd18e64150abc74b85bbbf6abf990f66fa47cacd /absl/random/internal/traits_test.cc
parentfcb104594b0bb4b8ac306cb2f55ecdad40974683 (diff)
Creation of LTS branch "lts_2019_08_08"20190808
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Diffstat (limited to 'absl/random/internal/traits_test.cc')
-rw-r--r--absl/random/internal/traits_test.cc126
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diff --git a/absl/random/internal/traits_test.cc b/absl/random/internal/traits_test.cc
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+// Copyright 2017 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/random/internal/traits.h"
+
+#include <cstdint>
+#include <type_traits>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+using absl::random_internal::is_widening_convertible;
+
+// CheckWideningConvertsToSelf<T1, T2, ...>()
+//
+// For each type T, checks:
+// - T IS widening-convertible to itself.
+//
+template <typename T>
+void CheckWideningConvertsToSelf() {
+ static_assert(is_widening_convertible<T, T>::value,
+ "Type is not convertible to self!");
+}
+
+template <typename T, typename Next, typename... Args>
+void CheckWideningConvertsToSelf() {
+ CheckWideningConvertsToSelf<T>();
+ CheckWideningConvertsToSelf<Next, Args...>();
+}
+
+// CheckNotWideningConvertibleWithSigned<T1, T2, ...>()
+//
+// For each unsigned-type T, checks that:
+// - T is NOT widening-convertible to Signed(T)
+// - Signed(T) is NOT widening-convertible to T
+//
+template <typename T>
+void CheckNotWideningConvertibleWithSigned() {
+ using signed_t = typename std::make_signed<T>::type;
+
+ static_assert(!is_widening_convertible<T, signed_t>::value,
+ "Unsigned type is convertible to same-sized signed-type!");
+ static_assert(!is_widening_convertible<signed_t, T>::value,
+ "Signed type is convertible to same-sized unsigned-type!");
+}
+
+template <typename T, typename Next, typename... Args>
+void CheckNotWideningConvertibleWithSigned() {
+ CheckNotWideningConvertibleWithSigned<T>();
+ CheckWideningConvertsToSelf<Next, Args...>();
+}
+
+// CheckWideningConvertsToLargerType<T1, T2, ...>()
+//
+// For each successive unsigned-types {Ti, Ti+1}, checks that:
+// - Ti IS widening-convertible to Ti+1
+// - Ti IS widening-convertible to Signed(Ti+1)
+// - Signed(Ti) is NOT widening-convertible to Ti
+// - Signed(Ti) IS widening-convertible to Ti+1
+template <typename T, typename Higher>
+void CheckWideningConvertsToLargerTypes() {
+ using signed_t = typename std::make_signed<T>::type;
+ using higher_t = Higher;
+ using signed_higher_t = typename std::make_signed<Higher>::type;
+
+ static_assert(is_widening_convertible<T, higher_t>::value,
+ "Type not embeddable into larger type!");
+ static_assert(is_widening_convertible<T, signed_higher_t>::value,
+ "Type not embeddable into larger signed type!");
+ static_assert(!is_widening_convertible<signed_t, higher_t>::value,
+ "Signed type is embeddable into larger unsigned type!");
+ static_assert(is_widening_convertible<signed_t, signed_higher_t>::value,
+ "Signed type not embeddable into larger signed type!");
+}
+
+template <typename T, typename Higher, typename Next, typename... Args>
+void CheckWideningConvertsToLargerTypes() {
+ CheckWideningConvertsToLargerTypes<T, Higher>();
+ CheckWideningConvertsToLargerTypes<Higher, Next, Args...>();
+}
+
+// CheckWideningConvertsTo<T, U, [expect]>
+//
+// Checks that T DOES widening-convert to U.
+// If "expect" is false, then asserts that T does NOT widening-convert to U.
+template <typename T, typename U, bool expect = true>
+void CheckWideningConvertsTo() {
+ static_assert(is_widening_convertible<T, U>::value == expect,
+ "Unexpected result for is_widening_convertible<T, U>!");
+}
+
+TEST(TraitsTest, IsWideningConvertibleTest) {
+ constexpr bool kInvalid = false;
+
+ CheckWideningConvertsToSelf<
+ uint8_t, uint16_t, uint32_t, uint64_t,
+ int8_t, int16_t, int32_t, int64_t,
+ float, double>();
+ CheckNotWideningConvertibleWithSigned<
+ uint8_t, uint16_t, uint32_t, uint64_t>();
+ CheckWideningConvertsToLargerTypes<
+ uint8_t, uint16_t, uint32_t, uint64_t>();
+
+ CheckWideningConvertsTo<float, double>();
+ CheckWideningConvertsTo<uint16_t, float>();
+ CheckWideningConvertsTo<uint32_t, double>();
+ CheckWideningConvertsTo<uint64_t, double, kInvalid>();
+ CheckWideningConvertsTo<double, float, kInvalid>();
+
+ CheckWideningConvertsTo<bool, int>();
+ CheckWideningConvertsTo<bool, float>();
+}
+
+} // namespace