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Adding expect<T> - a value-or-error implementation

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Lee Clagett 2018-09-10 21:25:15 -04:00
parent fad88e18a9
commit 55c7cd1458
7 changed files with 1564 additions and 0 deletions
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src/common/error.cpp Normal file
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// Copyright (c) 2018, The Monero Project
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other
// materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be
// used to endorse or promote products derived from this software without specific
// prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "error.h"
#include <string>
namespace
{
struct category final : std::error_category
{
virtual const char* name() const noexcept override final
{
return "common_category()";
}
virtual std::string message(int value) const override final
{
switch (common_error(value))
{
case common_error::kInvalidArgument:
return make_error_code(std::errc::invalid_argument).message();
case common_error::kInvalidErrorCode:
return "expect<T> was given an error value of zero";
default:
break;
}
return "Unknown basic_category() value";
}
virtual std::error_condition default_error_condition(int value) const noexcept override final
{
// maps specific errors to generic `std::errc` cases.
switch (common_error(value))
{
case common_error::kInvalidArgument:
case common_error::kInvalidErrorCode:
return std::errc::invalid_argument;
default:
break;
}
return std::error_condition{value, *this};
}
};
}
std::error_category const& common_category() noexcept
{
static const category instance{};
return instance;
}