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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
/* vim: set ts=2 sw=2 et tw=79: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* A struct for tracking exceptions that need to be thrown to JS.
*/
#ifndef mozilla_ErrorResult_h
#define mozilla_ErrorResult_h
#include "nscore.h"
#include "mozilla/Assertions.h"
namespace mozilla {
class ErrorResult {
public:
ErrorResult() {
mResult = NS_OK;
}
void Throw(nsresult rv) {
MOZ_ASSERT(NS_FAILED(rv), "Please don't try throwing success");
mResult = rv;
}
// In the future, we can add overloads of Throw that take more
// interesting things, like strings or DOM exception types or
// something if desired.
// Backwards-compat to make conversion simpler. We don't call
// Throw() here because people can easily pass success codes to
// this.
void operator=(nsresult rv) {
mResult = rv;
}
bool Failed() const {
return NS_FAILED(mResult);
}
nsresult ErrorCode() const {
return mResult;
}
private:
nsresult mResult;
// Not to be implemented, to make sure people always pass this by
// reference, not by value.
ErrorResult(const ErrorResult&) MOZ_DELETE;
};
} // namespace mozilla
#endif /* mozilla_ErrorResult_h */
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