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112 lines (97 loc) · 2.55 KB
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#pragma once
/*
* Copyright 2018-present Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.
*/
#include <cassert>
#include <utility>
namespace aws {
namespace lambda_runtime {
template <typename TResult, typename TFailure>
class outcome {
public:
outcome(TResult const& s) : m_s(s), m_success(true) {}
outcome(TResult&& s) : m_s(std::move(s)), m_success(true) {}
outcome(TFailure const& f) : m_f(f), m_success(false) {}
outcome(TFailure&& f) : m_f(std::move(f)), m_success(false) {}
outcome(outcome const& other) : m_success(other.m_success)
{
if (m_success) {
new (&m_s) TResult(other.m_s);
}
else {
new (&m_f) TFailure(other.m_f);
}
}
outcome(outcome&& other) noexcept : m_success(other.m_success)
{
if (m_success) {
new (&m_s) TResult(std::move(other.m_s));
}
else {
new (&m_f) TFailure(std::move(other.m_f));
}
}
~outcome() { destroy(); }
outcome& operator=(outcome&& other) noexcept
{
assert(this != &other);
destroy();
if (other.m_success) {
new (&m_s) TResult(std::move(other.m_s));
}
else {
new (&m_f) TFailure(std::move(other.m_f));
}
m_success = other.m_success;
return *this;
}
TResult const& get_result() const&
{
assert(m_success);
return m_s;
}
TResult&& get_result() &&
{
assert(m_success);
return std::move(m_s);
}
TFailure const& get_failure() const&
{
assert(!m_success);
return m_f;
}
TFailure&& get_failure() &&
{
assert(!m_success);
return std::move(m_f);
}
bool is_success() const { return m_success; }
private:
void destroy()
{
if (m_success) {
m_s.~TResult();
}
else {
m_f.~TFailure();
}
}
union {
TResult m_s;
TFailure m_f;
};
bool m_success;
};
} // namespace lambda_runtime
} // namespace aws