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(C++) GetSmallestDouble

 

BoostSTLQt CreatorLubuntuWindows

 

GetSmallestDouble is a checking code snippet to get the smallest value of an double.

 

Technical facts

 

Operating system(s) or programming environment(s)

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Qt project file: ./CppGetSmallestDouble/CppGetSmallestDouble.pro

 

include(../../ConsoleApplication.pri) #Or use the code below
# QT += core
# QT += gui
# greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
# CONFIG   += console
# CONFIG   -= app_bundle
# TEMPLATE = app
# CONFIG(release, debug|release) {
#   DEFINES += NDEBUG NTRACE_BILDERBIKKEL
# }
# QMAKE_CXXFLAGS += -std=c++11 -Wall -Wextra -Weffc++
# unix {
#   QMAKE_CXXFLAGS += -Werror
# }

include(../../Libraries/Boost.pri) #Or use the code below
# win32 {
#   INCLUDEPATH += \
#     ../../Libraries/boost_1_54_0
# }

SOURCES += main.cpp

 

 

 

 

 

./CppGetSmallestDouble/main.cpp

 

#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#pragma GCC diagnostic ignored "-Wunused-but-set-parameter"
#include <cassert>
#include <iostream>
#include <limits>

#include <boost/numeric/conversion/bounds.hpp>
#pragma GCC diagnostic pop

///GetSmallestDouble returns the smallest possible value of a double.
///From http://www.richelbilderbeek.nl/CppGetSmallestDouble.htm
double GetSmallestDoubleStl()
{
  return std::numeric_limits<double>::min();
}

///GetSmallestDouble returns the smallest possible value of a double.
///From http://www.richelbilderbeek.nl/CppGetSmallestDouble.htm
double GetSmallestDoubleBoost()
{
  return boost::numeric::bounds<double>::smallest();
}

int main()
{
  assert(GetSmallestDoubleStl() == GetSmallestDoubleBoost());
  std::cout
    << GetSmallestDoubleBoost() << '\n'
    << GetSmallestDoubleStl() << std::endl
  ;
}

/*

2.22507e-308
2.22507e-308
Press <RETURN> to close this window...

*/

 

 

 

 

 

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