Abseil Common Libraries (C++) (grcp 依赖)
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57 lines
1.8 KiB
57 lines
1.8 KiB
6 years ago
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// Copyright 2018 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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//
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#ifndef ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
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#define ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
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#include <utility>
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namespace absl {
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namespace random_internal {
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// DistributionCaller provides an opportunity to overload the general
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// mechanism for calling a distribution, allowing for mock-RNG classes
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// to intercept such calls.
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template <typename URBG>
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struct DistributionCaller {
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// Call the provided distribution type. The parameters are expected
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// to be explicitly specified.
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// DistrT is the distribution type.
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// FormatT is the formatter type:
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//
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// struct FormatT {
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// using result_type = distribution_t::result_type;
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// static std::string FormatCall(
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// const distribution_t& distr,
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// absl::Span<const result_type>);
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//
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// static std::string FormatExpectation(
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// absl::string_view match_args,
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// absl::Span<const result_t> results);
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// }
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//
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template <typename DistrT, typename FormatT, typename... Args>
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static typename DistrT::result_type Call(URBG* urbg, Args&&... args) {
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DistrT dist(std::forward<Args>(args)...);
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return dist(*urbg);
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}
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};
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} // namespace random_internal
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} // namespace absl
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#endif // ABSL_RANDOM_INTERNAL_DISTRIBUTION_CALLER_H_
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