1 // Copyright 2017 The Abseil Authors.
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
7 // https://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
15 // -----------------------------------------------------------------------------
16 // File: seed_gen_exception.h
17 // -----------------------------------------------------------------------------
19 // This header defines an exception class which may be thrown if unpredictable
20 // events prevent the derivation of suitable seed-material for constructing a
21 // bit generator conforming to [rand.req.urng] (eg. entropy cannot be read from
22 // /dev/urandom on a Unix-based system).
24 // Note: if exceptions are disabled, `std::terminate()` is called instead.
26 #ifndef ABSL_RANDOM_SEED_GEN_EXCEPTION_H_
27 #define ABSL_RANDOM_SEED_GEN_EXCEPTION_H_
33 //------------------------------------------------------------------------------
35 //------------------------------------------------------------------------------
36 class SeedGenException : public std::exception {
38 SeedGenException() = default;
39 ~SeedGenException() override;
40 const char* what() const noexcept override;
43 namespace random_internal {
46 [[noreturn]] void ThrowSeedGenException();
48 } // namespace random_internal
51 #endif // ABSL_RANDOM_SEED_GEN_EXCEPTION_H_