mirror of https://github.com/grpc/grpc.git
This reverts commit d4aed9e615.
pull/29763/head
Craig Tiller
3 years ago
committed by
GitHub
parent
2f6277c1fb
commit
9a46171833
19 changed files with 10 additions and 249 deletions
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// Copyright 2021 gRPC 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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// http://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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#ifndef GRPC_CORE_LIB_GPRPP_CAPTURE_H |
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#define GRPC_CORE_LIB_GPRPP_CAPTURE_H |
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#include <grpc/support/port_platform.h> |
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#include <tuple> |
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#include <type_traits> |
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#include "absl/utility/utility.h" |
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namespace grpc_core { |
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namespace detail { |
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template <typename F, typename... Captures> |
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class Capture { |
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public: |
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explicit Capture(F f, Captures... captures) |
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: f_(std::move(f)), captures_(std::move(captures)...) {} |
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template <typename... Args> |
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decltype(std::declval<F>()(static_cast<Captures*>(nullptr)..., |
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std::declval<Args>()...)) |
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operator()(Args... args) { |
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auto f = &f_; |
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return absl::apply( |
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[f, &args...](Captures&... captures) { |
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return (*f)(&captures..., std::move(args)...); |
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}, |
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captures_); |
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} |
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private: |
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GPR_NO_UNIQUE_ADDRESS F f_; |
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GPR_NO_UNIQUE_ADDRESS std::tuple<Captures...> captures_; |
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}; |
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} // namespace detail
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// C++11 helper - best explained by usage:
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//
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// BigThing big_thing;
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// auto f = Capture(
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// [](BigThing* c, int a, int b) { /*...*/ },
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// std::move(big_thing));
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//
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// results in: f being a callable that takes arguments (int a, int b), and
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// captures the original value of big_thing by move. Each call, a pointer to
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// each captured thing is inserted into the argument list at the beginning so it
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// can be manipulated.
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//
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// Captured values are mutable, and it's the users responsibility to ensure,
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// should this callable be invoked from different threads, that proper locking
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// is implemented.
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template <typename F, typename... Captures> |
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detail::Capture<F, Captures...> Capture(F f, Captures... captures) { |
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return detail::Capture<F, Captures...>(std::move(f), std::move(captures)...); |
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} |
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} // namespace grpc_core
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#endif // GRPC_CORE_LIB_GPRPP_CAPTURE_H
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@ -1,39 +0,0 @@ |
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// Copyright 2021 gRPC 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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// http://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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#include "src/core/lib/gprpp/capture.h" |
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#include <gtest/gtest.h> |
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namespace grpc_core { |
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TEST(CaptureTest, Capture) { |
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auto f = Capture([](int* p) { EXPECT_EQ(*p, 42); }, 42); |
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f(); |
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} |
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TEST(CaptureTest, WithArgsAndReturn) { |
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int captured = 1; |
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auto f = |
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Capture([captured](int* p, int arg) { return (captured + *p) * arg; }, 2); |
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EXPECT_EQ(f(2), 6); |
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EXPECT_EQ(f(3), 9); |
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} |
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} // namespace grpc_core
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int main(int argc, char** argv) { |
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::testing::InitGoogleTest(&argc, argv); |
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return RUN_ALL_TESTS(); |
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} |
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