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author | zheng_wenlong <wenlong_zheng@nexty-ele.com> | 2018-11-14 12:39:54 +0900 |
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committer | zheng_wenlong <wenlong_zheng@nexty-ele.com> | 2018-11-14 12:39:54 +0900 |
commit | 5f9be1b9c8e6a4b6d25d64e6f5ec28deb0525854 (patch) | |
tree | f1df13a6601a8065c3ecd5c73065b9d768b56c77 /demo3/common/agl-service-windowmanager/src/result.hpp | |
parent | 5025144c46ad116ba2f7b0506fb9b5c0b2b7a3e4 (diff) |
Add windowmanager-service and libraries
Add windowmanager-service and libraries.
Change-Id: I838b149ee8a62c0dbc6cb98e1fe8e45929e19140
Signed-off-by: zheng_wenlong <wenlong_zheng@nexty-ele.com>
Diffstat (limited to 'demo3/common/agl-service-windowmanager/src/result.hpp')
-rw-r--r-- | demo3/common/agl-service-windowmanager/src/result.hpp | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/demo3/common/agl-service-windowmanager/src/result.hpp b/demo3/common/agl-service-windowmanager/src/result.hpp new file mode 100644 index 0000000..8a59a90 --- /dev/null +++ b/demo3/common/agl-service-windowmanager/src/result.hpp @@ -0,0 +1,86 @@ +/* + * Copyright (c) 2017 TOYOTA MOTOR CORPORATION + * + * 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. + */ + +#ifndef TMCAGLWM_RESULT_HPP +#define TMCAGLWM_RESULT_HPP + +#include <experimental/optional> +#include <functional> + +namespace wm +{ + +using std::experimental::nullopt; +using std::experimental::optional; + +// We only ever return a string as an error - so just parametrize +// this over result type T +template <typename T> +struct result +{ + char const *e; + optional<T> t; + + bool is_ok() const { return this->t != nullopt; } + bool is_err() const { return this->e != nullptr; } + + T unwrap() + { + if (this->e != nullptr) + { + throw std::logic_error(this->e); + } + return this->t.value(); + } + + operator T() { return this->unwrap(); } + + char const *unwrap_err() { return this->e; } + + optional<T> const &ok() const { return this->t; } + optional<char const *> err() const + { + return this->e ? optional<char const *>(this->e) : nullopt; + } + + result<T> map_err(std::function<char const *(char const *)> f); +}; + +template <typename T> +struct result<T> Err(char const *e) +{ + return result<T>{e, nullopt}; +} + +template <typename T> +struct result<T> Ok(T t) +{ + return result<T>{nullptr, t}; +} + +template <typename T> +result<T> result<T>::map_err(std::function<char const *(char const *)> f) +{ + if (this->is_err()) + { + return Err<T>(f(this->e)); + } + return *this; +} + +} // namespace wm + +#endif // TMCAGLWM_RESULT_HPP |