Random-inl.h | Explore in Territory

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * 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
 *
 *     http://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 FOLLY_RANDOM_H_
#error This file may only be included from folly/Random.h
#endif

namespace folly {

namespace detail {

// Return the state size needed by RNG, expressed as a number of uint32_t
// integers. Specialized for all templates specified in the C++11 standard.
// For some (mersenne_twister_engine), this is exported as a state_size static
// data member; for others, the standard shows formulas.

template <class RNG, typename = void>
struct StateSize { … };

StateSize<RNG, void_t<decltype(RNG::state_size)>>;

StateSize<std::linear_congruential_engine<UIntType, a, c, m>>;

StateSize<std::subtract_with_carry_engine<UIntType, w, s, r>>;

StateSizeT;

template <class RNG>
struct SeedData { … };

} // namespace detail

template <class RNG, class /* EnableIf */>
void Random::seed(RNG& rng) { … }

template <class RNG, class /* EnableIf */>
auto Random::create() -> RNG { … }

} // namespace folly
folly/folly/Random-inl.h
