/**
\page StyleGuideAndNotesPage The MITK Style Guide and Technical Notes

\tableofcontents

The following document is a description of the accepted coding style for the Medical Imaging Interaction Toolkit (MITK). Developers who wish to contribute code to MITK should read and adhere to the standards described here.


\section StyleGuideAndNotesPage_NameConventions Naming Conventions

\li Using case change to indicate separate words
@code
ImageFilter
PixelType
DataStorage
NodePredicateProperty
@endcode

\li Underscores are not used e.g. Image_Filer, _Node

\li Variable names should convey the meaning behind the code
@code
BoundingBox::Pointer boundingBox = BoundingBox::New();
@endcode

\li Names are generally spelled out
@code
mitk::DataNode* node;
@endcode

\li Abbreviation are allowable when in common use e.g. ROI for Region of
Interest


\subsection StyleGuideAndNotesPage_NamingClasses Naming Classes

\li Classes are named beginning with a capital letter

\li Classes are named according to the following general rule:
@code
class name = <algorithm><input><concept>
@endcode

\li Examples of concepts  \n
<b>Accessor</b>: Access and convert between types e.g. NullScalarAccessor \n
<b>Container</b>: A container of objects such as points or images e.g. VectorContainer \n
<b>Filter</b>: A class that participates in the data processing pipeline e.g. AddImageFilter \n
<b>Mapper</b>: Transform data from one form into another e.g. ContourMapper2D \n
<b>Reader/Writer</b>: A class that reads/writes a single data object e.g. VtkSurfaceReader \n


\subsection StyleGuideAndNotesPage_NamingFiles Naming Files

\li MITK classes like @a ExampleClass should be in namespace @a mitk and their corresponding files should be named @a mitkExampleClass.h/.cpp.
@code
mitk::DataStorage
@endcode

\li Qt specific MITK classes like @a QmitkListView should have the prefix Qmitk in their class names and their corresponding files should be named @a QmitkListView.h/.cpp.
@code
QmitkDataStorageComboBox
@endcode

\li Header Files ends with an .h and

\li Implementation Files with an .cpp or .txx for a template class


\subsection StyleGuideAndNotesPage_NamingMethodsandFunctions Naming Methods and Functions

\li Functions and methods are named beginning with a capital letter

\li Referring to class methods in code, an explicit this-> pointer should be
used
@code
mitk::DataStorage::SetOfObjects::ConstPointer all = this->GetAll();
@endcode


\subsection StyleGuideAndNotesPage_NamingSignalSlots Naming Signal/Slots Methods and Functions

\li Slots are named according to the following general rule
@code
On[variable name who send the signal][signal]();
@endcode

\li Example
@code
connect( loadImagePushButton, SIGNAL( clicked(bool ) ),
SLOT( OnLoadImagePushButtonClicked( bool ) ) );

void mitk::Image::OnLoadImagePushButtonClicked( bool )
{
... Do something ...
}
@endcode

\li Signals are named according to the following general rule
@code
Signal[MethodName]();
@endcode

\li Example
@code
emit SignalFinishedSegmentation();
@endcode


\subsection StyleGuideAndNotesPage_NamingClassDataMembers Naming Class Data Members

\li Class data members are prefixed with m_
@code
m_Volumes
m_OffsetTable
m_ImageMask
@endcode

\li An exception to this rule, Qt class Data members are not prefixed and begin with a lower-case letter
@code
loadImageButton
closeImageAction
@endcode

\subsection StyleGuideAndNotesPage_NamingLocalVariables Naming Local Variables

\li Local variables first letter is lower-case
@code
offset
data
slicesIt
@endcode


\subsection StyleGuideAndNotesPage_NamingQtVariables Naming Qt Variables

\li GUI variables ends with name of used QT tool.
@code
QPushButton* loadImagePushButton;
QAction* closeImageAction;
QCheckBox* hideImageCheckBox;
QRadioButton* binaryImageRadioButton;
@endcode


\subsection StyleGuideAndNotesPage_NamingTypedefs Naming Typedefs

\li Typedefs must end in the word Type
@code
typedef TPixel PixelType;
typedef itk::Image< TPixel, VImageDimension > ImageType;
typedef std::list<mitk::Image::Pointer> ImageListType;
@endcode


\section StyleGuideAndNotesPage_Pointer Pointer

\subsection StyleGuideAndNotesPage_DeclarationofPointers Declaration of Pointers

\li Position of * pointers are connected with the variable
@code
int *counter;
@endcode

\li Analog to references
@code
int &counter;
@endcode


\subsection StyleGuideAndNotesPage_SmartPointer SmartPointer

\li SmartPointers must be used for classes that have itk::Object as a base
class.

\li Assignment of a just created instance to a normal pointer results in a
crash, since the reference count is decreased immediately to zero and the
object is destroyed.
@code
itk::Object::Pointer object = itk::Object::New();
@endcode

\li Static declarations are also forbidden and result into an exception when
the scope of the variable is left, because the destructor is called while the
reference count is still greater than zero.

\li Note that using smart pointers requires using real (normal) pointers when
setting input. If you want to return a newly created smart pointer that
is not also kept within the class (e.g., if you write a Clone method), you
have to return a smart pointer on output (compare itkMacro.h). If the
smart pointer is kept within the class, returning a real (normal) pointer
is sufficient.

\li Testing a SmartPointer against NULL is done with the IsNull() and Is-
NotNull() methods. A simple ==NULL issues a warning.


\section StyleGuideAndNotesPage_Namespace Namespace

\li MITK classes should be in namespace @a mitk
@code
mitk::Image::Pointer mitk::ImageGenerator::MakeImage()
{
// already in namespace mitk here!
Image::Pointer image = mitk::Image::New();
ImageDecorator::Pointer decorator = mitk::ImageDecorator::New();
d->Decorate( image );
return image;
}
@endcode

\li Constants in MITK for mitk::Operation and mitk::Action are set in
namespace, so don't forget to add prefix mitk::
@code
switch (actionId)
{
  case mitk::AcMOVESELECTED:
  ....Do something ...
    break;

  default:
    break;
}
@endcode


\section StyleGuideAndNotesPage_CodeLayoutandIndentation Code Layout and Indentation

\subsection StyleGuideAndNotesPage_GeneralLayout General Layout

\li Each line of code should take no more than 120 characters.

\li Use lots of whitespace to separate logical blocks of code, intermixed with
comments

\li <b>DO NOT USE TABS.</b> The standard indentation is <b>2 spaces</b> (see <a href="https://itk.org/Wiki/images/c/c6/ITKStyle.pdf">ITK Style Guide</a>). Configure your
editor accordingly.

\li DO NOT USE trailing whitespaces

\li Declaration of variables should be one declaration per line
@code
int 				sliceNumber;
char* 				stringName;
ImageType::Pointer 	image;
@endcode


\subsection StyleGuideAndNotesPage_ClassLayout Class Layout

\li Copyright
@code
/*============================================================================

The Medical Imaging Interaction Toolkit (MITK)

Copyright (c) German Cancer Research Center (DKFZ)
All rights reserved.

Use of this source code is governed by a 3-clause BSD license that can be
found in the LICENSE file.

============================================================================*/
@endcode

\li Includes [A .. Z]
@code
#include "... .h"
@endcode

\li Namespace
@code
namespace mitk
{
@endcode
DO NOT litter your header with "using namespace;"!


\li Class (Template)
@code
template <class TType>
class ClassName : public ImageBase<VImageDimension>
{
@endcode

\li Typedefs
@code
public:
  ....typedefs....
@endcode

\li Methods
@code
public:
  ....methods....
protected:
  ....methods....
private:
  ....methods....
@endcode

\li QT Signals
@code
signals:
  Signal...();
@endcode

\li QT Slots
@code
public slots:
  On...();
protected slots:
  On...();
@endcode

\li Data Member
@code
private/protected:
  ....class data members....
};
}
#endif
@endcode

\section StyleGuideAndNotesPage_UseofBraces Use of Braces

\li Used to delimit the scope of an if, for, while, switch.

\li Braces are placed on a line by themselves:
@code
for ( unsigned int i = 0; i < 3; ++i )
{
... do something ...
}
@endcode
or
@code
if ( condition )
{
... do something ...
}
else if ( other condition )
{
... do something ...
}
else
{
... do something ...
}
@endcode

\li You can choose to use braces on a line with a code block when the block
consists of a single line:
@code
if ( condition ) { foo = 1; }
else if ( condition2 ) { foo = 3; }
else { return; }
@endcode
or
@code
for ( unsigned int i = 0; i < 3; ++i) { x[i] = 0.0; }
@endcode


\section StyleGuideAndNotesPage_IncludeGuards Include Guards

\li \#include guard is a particular construct used to avoid the problem of
double inclusion when dealing with the \#include directive.

\li Naming convention for \#include guards is: ClassName_h

\li Following example demonstrates a problem that can arise if \#include guards
are missing: Here, the file child.cpp has indirectly included two copies of the text in the
header file grandfather.h. This causes a compilation error, since the structure
type foo is apparently defined twice.
@code
grandfather.h  struct foo
               {
                 int m Member;
               };

father.h       #include "grandfather.h"

child.h        #include "grandfather.h"
               #include "father.h"
@endcode


\subsection StyleGuideAndNotesPage_Useofincludeguards Use of \#include guards
\li Here, the first inclusion of grandfather.h causes the macro grandfather h to
be defined. Then, when child.cpp includes grandfather.h the second time,
the \#ifndef test fails, and the preprocessor skips down to the \#endif, thus
avoiding the second definition of struct foo. The program compiles correctly.
@code
grandfather.h  #ifndef grandfather h
               #define grandfather h
               struct foo
               {
                 int m Member;
               };

father.h       #include "grandfather.h"

child.h        #include "grandfather.h"
               #include "father.h"
@endcode


\section StyleGuideAndNotesPage_TechnicalNotes Some Technical Notes

\li Use forward declarations in header files wherever possible. Only include those header files in a header file
that are really necessary. Include the rest in the implementation file.

\li For classes inheriting directly or indirectly from @a itk::LightObject (most of the MITK-classes do so), the
class definition should include the mitkClassMacro. Additionally, if the class can be instantiated (normally the case,
if the class is not abstract) and has @em only a constructor without parameters, the constructor should be declared
protected and the @a itkFactorylessNewMacro should be used to create a @a New() method for instantiation. Here is an example:
@code
class ExampleClass : public SuperClassOfTheExampleClass
{
public:
    mitkClassMacro(ExampleClass, SuperClassOfTheExampleClass)
    itkFactorylessNewMacro(Self)
    [...]
protected:
    ExampleClass();
    virtual ~ExampleClass();
}
@endcode

\li Set- and Get-methods can be created with the macros @a itkSetObjectMacro(name,type) and
@a itkGetObjectMacro(name,type), respectively, if the @a type is derived from @a itk::LightObject or
@a itk::Object.

\li When using inner classes of a parent class which is templated, you have
to use the keyword @a typename for gcc 3.x and standard compliance. For example,
@a TreeChangeListener is an inner class of @a Tree, therefore use:
@code
class LinkedTree : public Tree<T>
{

public:
    typedef typename LinkedTree<T>::TreeChangeListener TreeChangeListener;
    [...]
}
@endcode
Another example:
@code
typename std::vector<TreeChangeListener*>::iterator pos = treeChangeListenerList.begin();
@endcode
@a iterator is an inner class of @a vector.

\li Constants in MITK for mitk::Operation and mitk::Action are set in namespace, so don't forget to add prefix @a mitk::
@code
switch (actionId)
  {
  case mitk::AcMOVESELECTED:
@endcode
Prefixes for the constants are to be used like corresponding others. See file @a Interactions\\mitkBaseInteraction\\mitkInteractionConst.h for further details.

\section StyleGuideAndNotesPage_AutomaticCodeFormatting Automatic Code Formatting

We offer a .clang-format file, which can be used to automatically format code acceptably.

For an explanation of the different options check out https://clang.llvm.org/docs/ClangFormatStyleOptions.html

*/
