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// Copyright 2024 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.
#ifndef Y_ABSL_RANDOM_INTERNAL_MOCK_VALIDATORS_H_
#define Y_ABSL_RANDOM_INTERNAL_MOCK_VALIDATORS_H_
#include <type_traits>
#include "y_absl/base/config.h"
#include "y_absl/base/internal/raw_logging.h"
#include "y_absl/random/internal/iostream_state_saver.h"
#include "y_absl/random/internal/uniform_helper.h"
#include "y_absl/strings/str_cat.h"
#include "y_absl/strings/string_view.h"
namespace y_absl {
Y_ABSL_NAMESPACE_BEGIN
namespace random_internal {
template <typename NumType>
class UniformDistributionValidator {
public:
// Handle y_absl::Uniform<NumType>(gen, y_absl::IntervalTag, lo, hi).
template <typename TagType>
static void Validate(NumType x, TagType tag, NumType lo, NumType hi) {
// For invalid ranges, y_absl::Uniform() simply returns one of the bounds.
if (x == lo && lo == hi) return;
ValidateImpl(std::is_floating_point<NumType>{}, x, tag, lo, hi);
}
// Handle y_absl::Uniform<NumType>(gen, lo, hi).
static void Validate(NumType x, NumType lo, NumType hi) {
Validate(x, IntervalClosedOpenTag(), lo, hi);
}
// Handle y_absl::Uniform<NumType>(gen).
static void Validate(NumType) {
// y_absl::Uniform<NumType>(gen) spans the entire range of `NumType`, so any
// value is okay. This overload exists because the validation logic attempts
// to call it anyway rather than adding extra SFINAE.
}
private:
static y_absl::string_view TagLbBound(IntervalClosedOpenTag) { return "["; }
static y_absl::string_view TagLbBound(IntervalOpenOpenTag) { return "("; }
static y_absl::string_view TagLbBound(IntervalClosedClosedTag) { return "["; }
static y_absl::string_view TagLbBound(IntervalOpenClosedTag) { return "("; }
static y_absl::string_view TagUbBound(IntervalClosedOpenTag) { return ")"; }
static y_absl::string_view TagUbBound(IntervalOpenOpenTag) { return ")"; }
static y_absl::string_view TagUbBound(IntervalClosedClosedTag) { return "]"; }
static y_absl::string_view TagUbBound(IntervalOpenClosedTag) { return "]"; }
template <typename TagType>
static void ValidateImpl(std::true_type /* is_floating_point */, NumType x,
TagType tag, NumType lo, NumType hi) {
UniformDistributionWrapper<NumType> dist(tag, lo, hi);
NumType lb = dist.a();
NumType ub = dist.b();
// uniform_real_distribution is always closed-open, so the upper bound is
// always non-inclusive.
Y_ABSL_INTERNAL_CHECK(lb <= x && x < ub,
y_absl::StrCat(x, " is not in ", TagLbBound(tag), lo,
", ", hi, TagUbBound(tag)));
}
template <typename TagType>
static void ValidateImpl(std::false_type /* is_floating_point */, NumType x,
TagType tag, NumType lo, NumType hi) {
using stream_type =
typename random_internal::stream_format_type<NumType>::type;
UniformDistributionWrapper<NumType> dist(tag, lo, hi);
NumType lb = dist.a();
NumType ub = dist.b();
Y_ABSL_INTERNAL_CHECK(
lb <= x && x <= ub,
y_absl::StrCat(stream_type{x}, " is not in ", TagLbBound(tag),
stream_type{lo}, ", ", stream_type{hi}, TagUbBound(tag)));
}
};
} // namespace random_internal
Y_ABSL_NAMESPACE_END
} // namespace y_absl
#endif // Y_ABSL_RANDOM_INTERNAL_MOCK_VALIDATORS_H_
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