/*
- * Copyright 2016 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
#pragma once
-#include <type_traits>
-#include <exception>
-#include <algorithm>
#include <folly/ExceptionWrapper.h>
#include <folly/Likely.h>
#include <folly/Memory.h>
#include <folly/Portability.h>
#include <folly/Unit.h>
+#include <exception>
+#include <stdexcept>
+#include <type_traits>
+#include <utility>
namespace folly {
-class TryException : public std::exception {
+class TryException : public std::logic_error {
public:
- explicit TryException(std::string message_arg) noexcept
- : message(std::move(message_arg)) {}
-
- const char* what() const noexcept override {
- return message.c_str();
- }
-
- bool operator==(const TryException& other) const noexcept {
- return other.message == this->message;
- }
-
- bool operator!=(const TryException& other) const noexcept {
- return !(*this == other);
- }
-
- protected:
- std::string message;
+ using std::logic_error::logic_error;
};
class UsingUninitializedTry : public TryException {
public:
- UsingUninitializedTry() noexcept : TryException("Using unitialized try") {}
+ UsingUninitializedTry() : TryException("Using uninitialized try") {}
};
/*
* @param e The exception_wrapper
*/
explicit Try(exception_wrapper e)
- : contains_(Contains::EXCEPTION),
- e_(folly::make_unique<exception_wrapper>(std::move(e))) {}
+ : contains_(Contains::EXCEPTION), e_(std::move(e)) {}
/*
* DEPRECATED
: contains_(Contains::EXCEPTION) {
try {
std::rethrow_exception(ep);
- } catch (const std::exception& e) {
- e_ = folly::make_unique<exception_wrapper>(std::current_exception(), e);
+ } catch (std::exception& e) {
+ e_ = exception_wrapper(std::current_exception(), e);
} catch (...) {
- e_ = folly::make_unique<exception_wrapper>(std::current_exception());
+ e_ = exception_wrapper(std::current_exception());
}
}
*/
template <class Ex>
bool hasException() const {
- return hasException() && e_->is_compatible_with<Ex>();
+ return hasException() && e_.is_compatible_with<Ex>();
}
exception_wrapper& exception() {
if (UNLIKELY(!hasException())) {
throw TryException("exception(): Try does not contain an exception");
}
- return *e_;
+ return e_;
}
const exception_wrapper& exception() const {
if (UNLIKELY(!hasException())) {
throw TryException("exception(): Try does not contain an exception");
}
- return *e_;
+ return e_;
}
/*
* @returns True if the Try held an Ex and func was executed, false otherwise
*/
template <class Ex, class F>
+ bool withException(F func) {
+ if (!hasException()) {
+ return false;
+ }
+ return e_.with_exception(std::move(func));
+ }
+ template <class Ex, class F>
bool withException(F func) const {
if (!hasException()) {
return false;
}
- return e_->with_exception(std::move(func));
+ return e_.with_exception(std::move(func));
}
template <bool isTry, typename R>
Contains contains_;
union {
T value_;
- std::unique_ptr<exception_wrapper> e_;
+ exception_wrapper e_;
};
};
*
* @param e The exception_wrapper
*/
- explicit Try(exception_wrapper e)
- : hasValue_(false),
- e_(folly::make_unique<exception_wrapper>(std::move(e))) {}
+ explicit Try(exception_wrapper e) : hasValue_(false), e_(std::move(e)) {}
/*
* DEPRECATED
try {
std::rethrow_exception(ep);
} catch (const std::exception& e) {
- e_ = folly::make_unique<exception_wrapper>(std::current_exception(), e);
+ e_ = exception_wrapper(std::current_exception(), e);
} catch (...) {
- e_ = folly::make_unique<exception_wrapper>(std::current_exception());
+ e_ = exception_wrapper(std::current_exception());
}
}
// Copy assigner
Try& operator=(const Try<void>& t) {
hasValue_ = t.hasValue_;
- if (t.e_) {
- e_ = folly::make_unique<exception_wrapper>(*t.e_);
- }
+ e_ = t.e_;
return *this;
}
// Copy constructor
// @returns True if the Try contains an exception of type Ex, false otherwise
template <class Ex>
bool hasException() const {
- return hasException() && e_->is_compatible_with<Ex>();
+ return hasException() && e_.is_compatible_with<Ex>();
}
/*
if (UNLIKELY(!hasException())) {
throw TryException("exception(): Try does not contain an exception");
}
- return *e_;
+ return e_;
}
const exception_wrapper& exception() const {
if (UNLIKELY(!hasException())) {
throw TryException("exception(): Try does not contain an exception");
}
- return *e_;
+ return e_;
}
/*
* @returns True if the Try held an Ex and func was executed, false otherwise
*/
template <class Ex, class F>
+ bool withException(F func) {
+ if (!hasException()) {
+ return false;
+ }
+ return e_.with_exception(std::move(func));
+ }
+ template <class Ex, class F>
bool withException(F func) const {
if (!hasException()) {
return false;
}
- return e_->with_exception(std::move(func));
+ return e_.with_exception(std::move(func));
}
template <bool, typename R>
private:
bool hasValue_;
- std::unique_ptr<exception_wrapper> e_{nullptr};
+ exception_wrapper e_;
};
/*
Try<void>>::type
makeTryWith(F&& f);
+template <typename... Ts>
+std::tuple<Ts...> unwrapTryTuple(std::tuple<folly::Try<Ts>...>&& ts);
+
} // folly
#include <folly/Try-inl.h>