crashpad/util/numeric/in_range_cast.h
Scott Graham 1a17e7e643 win: Avoid warnings about conversion to smaller integer types
e.g.

d:\src\crashpad\crashpad\util\numeric\in_range_cast.h(35) : warning C4244: 'return' : conversion from 'unsigned __int64' to 'uint32_t', possible loss of data
d:\src\crashpad\crashpad\util\numeric\in_range_cast.h(35) : warning C4244: 'return' : conversion from '__int64' to 'int32_t', possible loss of data
        d:\src\crashpad\crashpad\util\numeric\in_range_cast_test.cc(54) : see reference to function template instantiation 'Destination crashpad::InRangeCast<int32_t,__int64>(Source,Destination)' being compiled
        with
        [
            Destination=int32_t
,            Source=__int64
        ]

R=mark@chromium.org
BUG=crashpad:1

Review URL: https://codereview.chromium.org/800073003
2014-12-15 16:19:33 -08:00

45 lines
1.6 KiB
C++

// Copyright 2014 The Crashpad Authors. 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.
// 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 CRASHPAD_UTIL_NUMERIC_IN_RANGE_CAST_H_
#define CRASHPAD_UTIL_NUMERIC_IN_RANGE_CAST_H_
#include "base/logging.h"
#include "base/numerics/safe_conversions.h"
namespace crashpad {
//! \brief Casts to a different type if it can be done without data loss,
//! logging a warning message and returing a default value otherwise.
//!
//! \param[in] source The value to convert and return.
//! \param[in] default_value The default value to return, in the event that \a
//! source cannot be represented in the destination type.
//!
//! \return \a source if it can be represented in the destination type,
//! otherwise \a default_value.
template <typename Destination, typename Source>
Destination InRangeCast(Source source, Destination default_value) {
if (base::IsValueInRangeForNumericType<Destination>(source)) {
return static_cast<Destination>(source);
}
LOG(WARNING) << "value " << source << " out of range";
return static_cast<Destination>(default_value);
}
} // namespace crashpad
#endif // CRASHPAD_UTIL_NUMERIC_IN_RANGE_CAST_H_