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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.
*
*=========================================================================*/
#ifndef itkNumberToString_h
#define itkNumberToString_h
#include "itkMacro.h"
#include <string>
namespace itk
{
/** \class NumberToString
* \brief Convert floating and fixed point numbers to strings
*
* This class uses the double-conversion library to floating point and
* fixed point numbers to ASCII versions that are represented without
* numerical precision errors.
*
* Typical use:
* \#include "itkNumberToString.h"
* NumberToString<float> convert;
* float a = 1.0f/3.0f;
* std::cout << convert(a) << std::endl;
*
* The specialization `NumberToString<>` allows conversion from any type of number:
*
* NumberToString<> convert;
* float a = 1.0f/3.0f;
* auto b = std::numeric_limits<int>::max();
* std::cout << convert(a) << convert(b) << std::endl;
*
* \ingroup ITKCommon
*/
template <typename TValue = void>
class ITK_TEMPLATE_EXPORT NumberToString
{
public:
std::string
operator()(TValue val) const;
};
// declaration of specialization
template <>
ITKCommon_EXPORT std::string
NumberToString<double>::operator()(double val) const;
template <>
ITKCommon_EXPORT std::string
NumberToString<float>::operator()(float val) const;
template <>
class NumberToString<void>
{
public:
template <typename TValue>
std::string
operator()(const TValue val) const
{
constexpr NumberToString<TValue> convert{};
return convert(val);
}
};
/** Converts the specified numeric value to a string, using a `NumberToString` function object. Produces a full
* precision (lossless) string representation, also for `float`and `double`. Otherwise it is similar to `std::to_string`
*/
template <typename TValue>
std::string
ConvertNumberToString(const TValue val)
{
constexpr NumberToString<TValue> convert{};
return convert(val);
}
} // namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkNumberToString.hxx"
#endif
#endif
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