99 lines
3.8 KiB
C
99 lines
3.8 KiB
C
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// Copyright 2024 The Abseil Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef ABSL_RANDOM_INTERNAL_MOCK_VALIDATORS_H_
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#define ABSL_RANDOM_INTERNAL_MOCK_VALIDATORS_H_
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#include <type_traits>
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#include "absl/base/config.h"
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#include "absl/base/internal/raw_logging.h"
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#include "absl/random/internal/iostream_state_saver.h"
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#include "absl/random/internal/uniform_helper.h"
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#include "absl/strings/str_cat.h"
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#include "absl/strings/string_view.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace random_internal {
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template <typename NumType>
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class UniformDistributionValidator {
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public:
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// Handle absl::Uniform<NumType>(gen, absl::IntervalTag, lo, hi).
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template <typename TagType>
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static void Validate(NumType x, TagType tag, NumType lo, NumType hi) {
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// For invalid ranges, absl::Uniform() simply returns one of the bounds.
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if (x == lo && lo == hi) return;
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ValidateImpl(std::is_floating_point<NumType>{}, x, tag, lo, hi);
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}
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// Handle absl::Uniform<NumType>(gen, lo, hi).
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static void Validate(NumType x, NumType lo, NumType hi) {
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Validate(x, IntervalClosedOpenTag(), lo, hi);
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}
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// Handle absl::Uniform<NumType>(gen).
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static void Validate(NumType) {
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// absl::Uniform<NumType>(gen) spans the entire range of `NumType`, so any
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// value is okay. This overload exists because the validation logic attempts
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// to call it anyway rather than adding extra SFINAE.
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}
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private:
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static absl::string_view TagLbBound(IntervalClosedOpenTag) { return "["; }
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static absl::string_view TagLbBound(IntervalOpenOpenTag) { return "("; }
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static absl::string_view TagLbBound(IntervalClosedClosedTag) { return "["; }
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static absl::string_view TagLbBound(IntervalOpenClosedTag) { return "("; }
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static absl::string_view TagUbBound(IntervalClosedOpenTag) { return ")"; }
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static absl::string_view TagUbBound(IntervalOpenOpenTag) { return ")"; }
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static absl::string_view TagUbBound(IntervalClosedClosedTag) { return "]"; }
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static absl::string_view TagUbBound(IntervalOpenClosedTag) { return "]"; }
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template <typename TagType>
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static void ValidateImpl(std::true_type /* is_floating_point */, NumType x,
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TagType tag, NumType lo, NumType hi) {
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UniformDistributionWrapper<NumType> dist(tag, lo, hi);
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NumType lb = dist.a();
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NumType ub = dist.b();
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// uniform_real_distribution is always closed-open, so the upper bound is
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// always non-inclusive.
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ABSL_INTERNAL_CHECK(lb <= x && x < ub,
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absl::StrCat(x, " is not in ", TagLbBound(tag), lo,
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", ", hi, TagUbBound(tag)));
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}
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template <typename TagType>
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static void ValidateImpl(std::false_type /* is_floating_point */, NumType x,
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TagType tag, NumType lo, NumType hi) {
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using stream_type =
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typename random_internal::stream_format_type<NumType>::type;
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UniformDistributionWrapper<NumType> dist(tag, lo, hi);
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NumType lb = dist.a();
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NumType ub = dist.b();
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ABSL_INTERNAL_CHECK(
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lb <= x && x <= ub,
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absl::StrCat(stream_type{x}, " is not in ", TagLbBound(tag),
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stream_type{lo}, ", ", stream_type{hi}, TagUbBound(tag)));
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}
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};
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} // namespace random_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_RANDOM_INTERNAL_MOCK_VALIDATORS_H_
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