seed_gen_exception.h

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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.

//

// -----------------------------------------------------------------------------

// File: seed_gen_exception.h

// -----------------------------------------------------------------------------

//

// This header defines an exception class which may be thrown if unpredictable

// events prevent the derivation of suitable seed-material for constructing a

// bit generator conforming to [rand.req.urng] (eg. entropy cannot be read from

// /dev/urandom on a Unix-based system).

//

// Note: if exceptions are disabled, `std::terminate()` is called instead.

#ifndef ABSL_RANDOM_SEED_GEN_EXCEPTION_H_

#define ABSL_RANDOM_SEED_GEN_EXCEPTION_H_

#include <exception>

#include "absl/base/config.h"

namespace absl {

ABSL_NAMESPACE_BEGIN

//------------------------------------------------------------------------------

// SeedGenException

//------------------------------------------------------------------------------

class SeedGenException : public std::exception {

 public:

  SeedGenException() = default;

  ~SeedGenException() override;

  const char* what() const noexcept override;

};

namespace random_internal {

// throw delegator

[[noreturn]] void ThrowSeedGenException();

}  // namespace random_internal

ABSL_NAMESPACE_END

}  // namespace absl

#endif  // ABSL_RANDOM_SEED_GEN_EXCEPTION_H_