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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 "itkTestingMacros.h"
#include "itkStdStreamStateSave.h"
#include <sstream>
#include <cstdlib>
int
itkStdStreamStateSaveTest(int, char *[])
{
// Set the fillch of std::cout with an explicit default fill character
std::cout.fill(' ');
// Get the state for each format state variable for std::cout
std::streamsize defaultPrecision = std::cout.precision();
std::streamsize defaultWidth = std::cout.width();
const char defaultFill = std::cout.fill();
std::ios_base::fmtflags defaultFlags = std::cout.flags();
{
itk::StdStreamStateSave coutState(std::cout);
// Change some representative state variables
std::cout.precision(14);
std::cout.width(25);
int anInt = 123;
std::cout.fill('%');
std::cout << std::left << anInt << std::endl;
std::cout << std::showpos << anInt << std::endl;
std::cout << std::hex << anInt << std::endl;
std::cout << std::showbase << std::hex << anInt << std::endl;
bool aBool = false;
std::cout << aBool << std::endl;
std::cout << std::boolalpha << aBool << std::endl;
double aDouble = 123.e-5;
std::cout << aDouble << std::endl;
std::cout << std::scientific << aDouble << std::endl;
} // coutState goes out of scope and will restore original format state
std::stringstream stream;
// Set the fillch of std::stringstream with an explicit default fill character
stream.fill(' ');
int originalInt = 10;
{
itk::StdStreamStateSave sstreamState(stream);
// Change some representative state variables
stream.precision(14);
stream.width(25);
int anInt = originalInt;
stream.fill('%');
stream << std::left << anInt << std::endl;
stream << std::showpos << anInt << std::endl;
stream << std::hex << anInt << std::endl;
stream << std::showbase << std::hex << anInt << std::endl;
bool aBool = false;
stream << aBool << std::endl;
stream << std::boolalpha << aBool << std::endl;
double aDouble = 123.e-5;
stream << aDouble << std::endl;
stream << std::scientific << aDouble << std::endl;
} // sstreamState goes out of scope and will restore original format state
// Verify the value read from the stream matches the original value
// written to the stream. If they do not match, then the hex state
// is still in effect.
int inputInt;
stream >> inputInt;
ITK_TEST_EXPECT_EQUAL(originalInt, inputInt);
// Verify that the default is reset for std::cout
ITK_TEST_EXPECT_EQUAL(std::cout.precision(), defaultPrecision);
ITK_TEST_EXPECT_EQUAL(std::cout.width(), defaultWidth);
ITK_TEST_EXPECT_EQUAL(std::cout.fill(), defaultFill);
ITK_TEST_EXPECT_EQUAL(std::cout.flags(), defaultFlags);
ITK_TEST_EXPECT_EQUAL(stream.precision(), defaultPrecision);
ITK_TEST_EXPECT_EQUAL(stream.width(), defaultWidth);
ITK_TEST_EXPECT_EQUAL(stream.fill(), defaultFill);
ITK_TEST_EXPECT_EQUAL(stream.flags(), defaultFlags);
return EXIT_SUCCESS;
}
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