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62238097c9
This is a safe cleanup change since top-level const applied to parameters in function declarations (that are not also definitions) are ignored by the compiler. Hence, such changes do not change the type of the declared functions and are simply no-ops. Bug: webrtc:13610 Change-Id: Ibafb92c45119a6d8bdb6f9109aa8dad6385163a9 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/249086 Reviewed-by: Niels Moller <nisse@webrtc.org> Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Ali Tofigh <alito@webrtc.org> Cr-Commit-Position: refs/heads/main@{#35802}
110 lines
3.7 KiB
C++
110 lines
3.7 KiB
C++
/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_EXPERIMENTS_STRUCT_PARAMETERS_PARSER_H_
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#define RTC_BASE_EXPERIMENTS_STRUCT_PARAMETERS_PARSER_H_
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#include <functional>
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#include <map>
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#include <memory>
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#include <string>
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#include <utility>
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#include <vector>
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#include "absl/memory/memory.h"
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#include "absl/strings/string_view.h"
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#include "absl/types/optional.h"
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#include "rtc_base/experiments/field_trial_parser.h"
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#include "rtc_base/experiments/field_trial_units.h"
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#include "rtc_base/string_encode.h"
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namespace webrtc {
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namespace struct_parser_impl {
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struct TypedMemberParser {
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public:
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bool (*parse)(absl::string_view src, void* target);
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void (*encode)(const void* src, std::string* target);
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};
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struct MemberParameter {
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const char* key;
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void* member_ptr;
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TypedMemberParser parser;
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};
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template <typename T>
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class TypedParser {
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public:
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static bool Parse(absl::string_view src, void* target);
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static void Encode(const void* src, std::string* target);
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};
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// Instantiated in cc file to avoid duplication during compile. Add additional
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// parsers as needed. Generally, try to use these suggested types even if the
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// context where the value is used might require a different type. For instance,
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// a size_t representing a packet size should use an int parameter as there's no
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// need to support packet sizes larger than INT32_MAX.
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extern template class TypedParser<bool>;
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extern template class TypedParser<double>;
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extern template class TypedParser<int>;
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extern template class TypedParser<unsigned>;
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extern template class TypedParser<absl::optional<double>>;
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extern template class TypedParser<absl::optional<int>>;
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extern template class TypedParser<absl::optional<unsigned>>;
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extern template class TypedParser<DataRate>;
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extern template class TypedParser<DataSize>;
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extern template class TypedParser<TimeDelta>;
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extern template class TypedParser<absl::optional<DataRate>>;
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extern template class TypedParser<absl::optional<DataSize>>;
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extern template class TypedParser<absl::optional<TimeDelta>>;
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template <typename T>
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void AddMembers(MemberParameter* out, const char* key, T* member) {
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*out = MemberParameter{
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key, member,
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TypedMemberParser{&TypedParser<T>::Parse, &TypedParser<T>::Encode}};
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}
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template <typename T, typename... Args>
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void AddMembers(MemberParameter* out,
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const char* key,
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T* member,
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Args... args) {
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AddMembers(out, key, member);
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AddMembers(++out, args...);
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}
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} // namespace struct_parser_impl
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class StructParametersParser {
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public:
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template <typename T, typename... Args>
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static std::unique_ptr<StructParametersParser> Create(const char* first_key,
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T* first_member,
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Args... args) {
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std::vector<struct_parser_impl::MemberParameter> members(
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sizeof...(args) / 2 + 1);
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struct_parser_impl::AddMembers(&members.front(), std::move(first_key),
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first_member, args...);
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return absl::WrapUnique(new StructParametersParser(std::move(members)));
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}
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void Parse(absl::string_view src);
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std::string Encode() const;
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private:
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explicit StructParametersParser(
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std::vector<struct_parser_impl::MemberParameter> members);
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std::vector<struct_parser_impl::MemberParameter> members_;
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};
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} // namespace webrtc
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#endif // RTC_BASE_EXPERIMENTS_STRUCT_PARAMETERS_PARSER_H_
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