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itkNumberToString.cxx
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itkNumberToString.cxx
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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://www.apache.org/licenses/LICENSE-2.0.txt
*
* 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.
*
*=========================================================================*/
#include "itkNumberToString.h"
#include "double-conversion/double-to-string.h"
#include <sstream>
namespace
{
bool
ConvertToShortest(const double_conversion::DoubleToStringConverter & converter,
const double val,
double_conversion::StringBuilder & builder)
{
return converter.ToShortest(val, &builder);
}
bool
ConvertToShortest(const double_conversion::DoubleToStringConverter & converter,
const float val,
double_conversion::StringBuilder & builder)
{
// Call the converter member function that is specific for single-precision `float`.
return converter.ToShortestSingle(val, &builder);
}
template <typename TValue>
std::string
FloatingPointNumberToString(const TValue val)
{
// Declare a buffer, large enough for strings like:
// "-100000000000000000000" (-1e20, either float or double, 23 chars)
// "-1.7976931348623157e+308" (-DBL_MAX, 25 chars)
// "-0.0000033333333333333333" (-3e-005/9.0, 26 chars)
char buf[32];
double_conversion::StringBuilder builder(buf, sizeof(buf));
if (!ConvertToShortest(double_conversion::DoubleToStringConverter::EcmaScriptConverter(), val, builder))
{
itkGenericExceptionMacro(<< "Conversion failed for " << val);
}
return std::string(builder.Finalize());
}
} // namespace
namespace itk
{
template <>
std::string
NumberToString<double>::operator()(double val) const
{
return FloatingPointNumberToString(val);
}
template <>
std::string
NumberToString<float>::operator()(float val) const
{
return FloatingPointNumberToString(val);
}
} // namespace itk