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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkSmartPointer.h"
#include "vtkNumberToString.h"
#include "vtkTypeTraits.h"
#include <limits>
#include <sstream>
#include <vtkMinimalStandardRandomSequence.h>
namespace
{
template <typename T>
int TestConvertPrecision(unsigned int samples);
template <typename T>
int TestConvertLowHigh(unsigned int samples);
template <typename T>
int ConvertNumericLimitsValue(const char* t, T);
}
int TestNumberToString(int, char*[])
{
int status = EXIT_SUCCESS;
std::cout << "Testing <numeric_limits>..." << std::endl;
if (ConvertNumericLimitsValue("unsigned short", static_cast<unsigned short>(0)) == EXIT_FAILURE)
{
status = EXIT_FAILURE;
}
if (ConvertNumericLimitsValue("short", static_cast<short>(0)) == EXIT_FAILURE)
{
status = EXIT_FAILURE;
}
if (ConvertNumericLimitsValue("unsigned int", static_cast<unsigned int>(0)) == EXIT_FAILURE)
{
status = EXIT_FAILURE;
}
if (ConvertNumericLimitsValue("int", static_cast<int>(0)) == EXIT_FAILURE)
{
status = EXIT_FAILURE;
}
if (ConvertNumericLimitsValue("unsigned long", static_cast<unsigned long>(0)) == EXIT_FAILURE)
{
status = EXIT_FAILURE;
}
if (ConvertNumericLimitsValue("long", static_cast<int>(0)) == EXIT_FAILURE)
{
status = EXIT_FAILURE;
}
if (ConvertNumericLimitsValue("float", static_cast<float>(0)) == EXIT_FAILURE)
{
status = EXIT_FAILURE;
}
if (ConvertNumericLimitsValue("double", static_cast<double>(0)) == EXIT_FAILURE)
{
status = EXIT_FAILURE;
}
if (status == EXIT_FAILURE)
{
return status;
}
unsigned int samples = 10000;
if (TestConvertPrecision<float>(samples) || TestConvertPrecision<double>(samples))
{
return EXIT_FAILURE;
}
if (TestConvertLowHigh<float>(samples) || TestConvertLowHigh<double>(samples))
{
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
namespace
{
template <typename T>
int TestConvertPrecision(unsigned int samples)
{
std::cout << "Testing type: " << typeid(T).name() << std::endl;
vtkNumberToString converter;
for (int p = 5; p < 20; ++p)
{
unsigned int matches = 0;
unsigned int mismatches = 0;
// Now convert numbers to strings. Read the strings as floats and doubles
// and compare the results with the original values.
{
vtkSmartPointer<vtkMinimalStandardRandomSequence> randomSequence =
vtkSmartPointer<vtkMinimalStandardRandomSequence>::New();
for (unsigned int i = 0; i < samples; ++i)
{
randomSequence->Next();
T value = randomSequence->GetRangeValue(-1.0, 1.0);
std::stringstream convertedStr;
convertedStr << converter.Convert(value);
std::stringstream rawStr;
rawStr << std::setprecision(p) << value;
T convertedValue;
std::istringstream convertedStream(convertedStr.str());
convertedStream >> convertedValue;
if (convertedValue != value)
{
std::cout << "ERROR: " << value << " != " << convertedValue << std::endl;
++mismatches;
}
T rawValue;
std::istringstream rawStream(rawStr.str());
rawStream >> rawValue;
if (rawValue == value)
{
++matches;
}
}
}
std::cout << "For precision " << p << " Matches without conversion: " << matches << std::endl;
std::cout << " MisMatches with conversion: " << mismatches << std::endl;
if (mismatches)
{
return EXIT_FAILURE;
}
if (matches == samples)
{
std::cout << "The minimum precision for type " << typeid(T).name() << " is " << p
<< std::endl;
break;
}
}
return EXIT_SUCCESS;
}
template <typename T>
int TestConvertLowHigh(unsigned int samples)
{
// Now convert numbers to strings. Read the strings as floats and doubles
// and compare the results with the original values.
for (int iLow = -20; iLow <= 0; iLow++)
{
for (int iHigh = 0; iHigh <= 20; iHigh++)
{
std::cout << "Testing low exponent: " << iLow << ", high exponent: " << iHigh << "."
<< std::endl;
vtkNumberToString converter;
converter.SetLowExponent(iLow);
converter.SetHighExponent(iHigh);
vtkSmartPointer<vtkMinimalStandardRandomSequence> randomSequence =
vtkSmartPointer<vtkMinimalStandardRandomSequence>::New();
for (unsigned int i = 0; i < samples; ++i)
{
randomSequence->Next();
T value = randomSequence->GetRangeValue(
std::numeric_limits<T>::min(), std::numeric_limits<T>::max());
std::string str = converter.Convert(value);
T convertedValue = std::stod(str);
if (convertedValue != value)
{
std::cout << "ERROR: " << value << " != " << convertedValue << std::endl;
return EXIT_FAILURE;
}
}
}
}
return EXIT_SUCCESS;
}
template <typename T>
int ConvertNumericLimitsValue(const char* t, T)
{
vtkNumberToString converter;
int status = EXIT_SUCCESS;
{
T value = std::numeric_limits<T>::max();
std::stringstream convertedStr;
convertedStr << converter.Convert(value);
std::istringstream convertedStream(convertedStr.str());
std::cout << t << "(max) "
<< "raw: " << value << " converted: " << convertedStream.str() << std::endl;
T convertedValue;
convertedStream >> convertedValue;
if (value != convertedValue)
{
std::cout << "ERROR: Bad conversion of std::max" << std::endl;
status = EXIT_FAILURE;
}
}
{
T value = std::numeric_limits<T>::min();
std::stringstream convertedStr;
convertedStr << converter.Convert(value);
std::istringstream convertedStream(convertedStr.str());
std::cout << t << "(min) "
<< "raw: " << value << " converted: " << convertedStream.str() << std::endl;
T convertedValue;
convertedStream >> convertedValue;
if (value != convertedValue)
{
std::cout << "ERROR: Bad conversion of std::min" << std::endl;
status = EXIT_FAILURE;
}
}
{
T value = std::numeric_limits<T>::lowest();
std::stringstream convertedStr;
convertedStr << converter.Convert(value);
std::istringstream convertedStream(convertedStr.str());
std::cout << t << "(lowest) "
<< "raw: " << value << " converted: " << convertedStream.str() << std::endl;
T convertedValue;
convertedStream >> convertedValue;
if (value != convertedValue)
{
std::cout << "ERROR: Bad conversion of std::lowest" << std::endl;
status = EXIT_FAILURE;
}
}
{
T value = std::numeric_limits<T>::epsilon();
std::stringstream convertedStr;
convertedStr << converter.Convert(value);
std::istringstream convertedStream(convertedStr.str());
std::cout << t << "(epsilon) "
<< "raw: " << value << " converted: " << convertedStream.str() << std::endl;
T convertedValue;
convertedStream >> convertedValue;
if (value != convertedValue)
{
std::cout << "ERROR: Bad conversion of std::epsilon" << std::endl;
status = EXIT_FAILURE;
}
}
return status;
}
}
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