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concepts_after_response.cc
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concepts_after_response.cc
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// Copyright 2020 Google LLC
//
// 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.
// [START functions_concepts_after_response]
#include <google/cloud/functions/function.h>
#include <future>
namespace gcf = ::google::cloud::functions;
gcf::Function concepts_after_response() {
return gcf::MakeFunction([](gcf::HttpRequest const&) {
(void)std::async(std::launch::async, [] {
// This code may fail to complete, or even fail to start at all.
auto constexpr kIterations = 10;
int sum = 0;
for (int i = 0; i != kIterations; ++i) sum += i;
return sum;
});
return gcf::HttpResponse{}.set_payload("Hello World!");
});
}
// [END functions_concepts_after_response]