move the documentation to doc/, add dummy documentation to srcdir/ compiling to

an explanation of how to generate the docs

6 files changed, 416 insertions, 127 deletions

diff --git a/Doxyfile b/Doxyfile
index d009f348c..c4c5456c6 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -85,7 +85,7 @@ WARN_LOGFILE           =
 #---------------------------------------------------------------------------
 # configuration options related to the input files
 #---------------------------------------------------------------------------
-INPUT                  = src/ ./
+INPUT                  = ./
 INPUT_ENCODING         = UTF-8
 FILE_PATTERNS          = *.c \
                          *.cc \
diff --git a/Doxyfile.in b/Doxyfile.in
new file mode 100644
index 000000000..d009f348c
--- /dev/null
+++ b/Doxyfile.in
@@ -0,0 +1,281 @@
+# Doxyfile 1.5.3
+
+#---------------------------------------------------------------------------
+# Project related configuration options
+#---------------------------------------------------------------------------
+DOXYFILE_ENCODING      = UTF-8
+PROJECT_NAME           = Eigen
+PROJECT_NUMBER         = 2.0-alpha1
+OUTPUT_DIRECTORY       = ./
+CREATE_SUBDIRS         = NO
+OUTPUT_LANGUAGE        = English
+BRIEF_MEMBER_DESC      = YES
+REPEAT_BRIEF           = YES
+ABBREVIATE_BRIEF       = "The $name class" \
+                         "The $name widget" \
+                         "The $name file" \
+                         is \
+                         provides \
+                         specifies \
+                         contains \
+                         represents \
+                         a \
+                         an \
+                         the
+ALWAYS_DETAILED_SEC    = NO
+INLINE_INHERITED_MEMB  = NO
+FULL_PATH_NAMES        = NO
+STRIP_FROM_PATH        = 
+STRIP_FROM_INC_PATH    = 
+SHORT_NAMES            = NO
+JAVADOC_AUTOBRIEF      = NO
+QT_AUTOBRIEF           = NO
+MULTILINE_CPP_IS_BRIEF = NO
+DETAILS_AT_TOP         = NO
+INHERIT_DOCS           = YES
+SEPARATE_MEMBER_PAGES  = NO
+TAB_SIZE               = 8
+ALIASES                = 
+OPTIMIZE_OUTPUT_FOR_C  = NO
+OPTIMIZE_OUTPUT_JAVA   = NO
+BUILTIN_STL_SUPPORT    = NO
+CPP_CLI_SUPPORT        = NO
+DISTRIBUTE_GROUP_DOC   = NO
+SUBGROUPING            = YES
+#---------------------------------------------------------------------------
+# Build related configuration options
+#---------------------------------------------------------------------------
+EXTRACT_ALL            = NO
+EXTRACT_PRIVATE        = NO
+EXTRACT_STATIC         = NO
+EXTRACT_LOCAL_CLASSES  = NO
+EXTRACT_LOCAL_METHODS  = NO
+EXTRACT_ANON_NSPACES   = NO
+HIDE_UNDOC_MEMBERS     = YES
+HIDE_UNDOC_CLASSES     = YES
+HIDE_FRIEND_COMPOUNDS  = YES
+HIDE_IN_BODY_DOCS      = NO
+INTERNAL_DOCS          = NO
+CASE_SENSE_NAMES       = YES
+HIDE_SCOPE_NAMES       = YES
+SHOW_INCLUDE_FILES     = YES
+INLINE_INFO            = YES
+SORT_MEMBER_DOCS       = YES
+SORT_BRIEF_DOCS        = NO
+SORT_BY_SCOPE_NAME     = NO
+GENERATE_TODOLIST      = YES
+GENERATE_TESTLIST      = YES
+GENERATE_BUGLIST       = YES
+GENERATE_DEPRECATEDLIST= YES
+ENABLED_SECTIONS       = 
+MAX_INITIALIZER_LINES  = 30
+SHOW_USED_FILES        = YES
+SHOW_DIRECTORIES       = NO
+FILE_VERSION_FILTER    = 
+#---------------------------------------------------------------------------
+# configuration options related to warning and progress messages
+#---------------------------------------------------------------------------
+QUIET                  = NO
+WARNINGS               = YES
+WARN_IF_UNDOCUMENTED   = YES
+WARN_IF_DOC_ERROR      = YES
+WARN_NO_PARAMDOC       = NO
+WARN_FORMAT            = "$file:$line: $text"
+WARN_LOGFILE           = 
+#---------------------------------------------------------------------------
+# configuration options related to the input files
+#---------------------------------------------------------------------------
+INPUT                  = src/ ./
+INPUT_ENCODING         = UTF-8
+FILE_PATTERNS          = *.c \
+                         *.cc \
+                         *.cxx \
+                         *.cpp \
+                         *.c++ \
+                         *.d \
+                         *.java \
+                         *.ii \
+                         *.ixx \
+                         *.ipp \
+                         *.i++ \
+                         *.inl \
+                         *.h \
+                         *.hh \
+                         *.hxx \
+                         *.hpp \
+                         *.h++ \
+                         *.idl \
+                         *.odl \
+                         *.cs \
+                         *.php \
+                         *.php3 \
+                         *.inc \
+                         *.m \
+                         *.mm \
+                         *.dox \
+                         *.py \
+                         *.C \
+                         *.CC \
+                         *.C++ \
+                         *.II \
+                         *.I++ \
+                         *.H \
+                         *.HH \
+                         *.H++ \
+                         *.CS \
+                         *.PHP \
+                         *.PHP3 \
+                         *.M \
+                         *.MM \
+                         *.PY
+RECURSIVE              = NO
+EXCLUDE                = 
+EXCLUDE_SYMLINKS       = NO
+EXCLUDE_PATTERNS       = 
+EXCLUDE_SYMBOLS        = 
+EXAMPLE_PATH           = doc/examples/
+EXAMPLE_PATTERNS       = *
+EXAMPLE_RECURSIVE      = NO
+IMAGE_PATH             = 
+INPUT_FILTER           = 
+FILTER_PATTERNS        = 
+FILTER_SOURCE_FILES    = NO
+#---------------------------------------------------------------------------
+# configuration options related to source browsing
+#---------------------------------------------------------------------------
+SOURCE_BROWSER         = NO
+INLINE_SOURCES         = NO
+STRIP_CODE_COMMENTS    = YES
+REFERENCED_BY_RELATION = YES
+REFERENCES_RELATION    = YES
+REFERENCES_LINK_SOURCE = YES
+USE_HTAGS              = NO
+VERBATIM_HEADERS       = YES
+#---------------------------------------------------------------------------
+# configuration options related to the alphabetical class index
+#---------------------------------------------------------------------------
+ALPHABETICAL_INDEX     = NO
+COLS_IN_ALPHA_INDEX    = 5
+IGNORE_PREFIX          = 
+#---------------------------------------------------------------------------
+# configuration options related to the HTML output
+#---------------------------------------------------------------------------
+GENERATE_HTML          = YES
+HTML_OUTPUT            = html
+HTML_FILE_EXTENSION    = .html
+HTML_HEADER            = 
+HTML_FOOTER            = 
+HTML_STYLESHEET        = 
+HTML_ALIGN_MEMBERS     = YES
+GENERATE_HTMLHELP      = NO
+HTML_DYNAMIC_SECTIONS  = NO
+CHM_FILE               = 
+HHC_LOCATION           = 
+GENERATE_CHI           = NO
+BINARY_TOC             = NO
+TOC_EXPAND             = NO
+DISABLE_INDEX          = NO
+ENUM_VALUES_PER_LINE   = 4
+GENERATE_TREEVIEW      = NO
+TREEVIEW_WIDTH         = 250
+#---------------------------------------------------------------------------
+# configuration options related to the LaTeX output
+#---------------------------------------------------------------------------
+GENERATE_LATEX         = YES
+LATEX_OUTPUT           = latex
+LATEX_CMD_NAME         = latex
+MAKEINDEX_CMD_NAME     = makeindex
+COMPACT_LATEX          = NO
+PAPER_TYPE             = a4wide
+EXTRA_PACKAGES         = 
+LATEX_HEADER           = 
+PDF_HYPERLINKS         = NO
+USE_PDFLATEX           = NO
+LATEX_BATCHMODE        = NO
+LATEX_HIDE_INDICES     = NO
+#---------------------------------------------------------------------------
+# configuration options related to the RTF output
+#---------------------------------------------------------------------------
+GENERATE_RTF           = NO
+RTF_OUTPUT             = rtf
+COMPACT_RTF            = NO
+RTF_HYPERLINKS         = NO
+RTF_STYLESHEET_FILE    = 
+RTF_EXTENSIONS_FILE    = 
+#---------------------------------------------------------------------------
+# configuration options related to the man page output
+#---------------------------------------------------------------------------
+GENERATE_MAN           = NO
+MAN_OUTPUT             = man
+MAN_EXTENSION          = .3
+MAN_LINKS              = NO
+#---------------------------------------------------------------------------
+# configuration options related to the XML output
+#---------------------------------------------------------------------------
+GENERATE_XML           = NO
+XML_OUTPUT             = xml
+XML_SCHEMA             = 
+XML_DTD                = 
+XML_PROGRAMLISTING     = YES
+#---------------------------------------------------------------------------
+# configuration options for the AutoGen Definitions output
+#---------------------------------------------------------------------------
+GENERATE_AUTOGEN_DEF   = NO
+#---------------------------------------------------------------------------
+# configuration options related to the Perl module output
+#---------------------------------------------------------------------------
+GENERATE_PERLMOD       = NO
+PERLMOD_LATEX          = NO
+PERLMOD_PRETTY         = YES
+PERLMOD_MAKEVAR_PREFIX = 
+#---------------------------------------------------------------------------
+# Configuration options related to the preprocessor   
+#---------------------------------------------------------------------------
+ENABLE_PREPROCESSING   = YES
+MACRO_EXPANSION        = NO
+EXPAND_ONLY_PREDEF     = NO
+SEARCH_INCLUDES        = YES
+INCLUDE_PATH           = 
+INCLUDE_FILE_PATTERNS  = 
+PREDEFINED             = 
+EXPAND_AS_DEFINED      = 
+SKIP_FUNCTION_MACROS   = YES
+#---------------------------------------------------------------------------
+# Configuration::additions related to external references   
+#---------------------------------------------------------------------------
+TAGFILES               = 
+GENERATE_TAGFILE       = 
+ALLEXTERNALS           = NO
+EXTERNAL_GROUPS        = YES
+PERL_PATH              = /usr/bin/perl
+#---------------------------------------------------------------------------
+# Configuration options related to the dot tool   
+#---------------------------------------------------------------------------
+CLASS_DIAGRAMS         = YES
+MSCGEN_PATH            = 
+HIDE_UNDOC_RELATIONS   = YES
+HAVE_DOT               = YES
+CLASS_GRAPH            = YES
+COLLABORATION_GRAPH    = YES
+GROUP_GRAPHS           = YES
+UML_LOOK               = NO
+TEMPLATE_RELATIONS     = NO
+INCLUDE_GRAPH          = YES
+INCLUDED_BY_GRAPH      = YES
+CALL_GRAPH             = NO
+CALLER_GRAPH           = NO
+GRAPHICAL_HIERARCHY    = YES
+DIRECTORY_GRAPH        = YES
+DOT_IMAGE_FORMAT       = png
+DOT_PATH               = 
+DOTFILE_DIRS           = 
+DOT_GRAPH_MAX_NODES    = 50
+MAX_DOT_GRAPH_DEPTH    = 1000
+DOT_TRANSPARENT        = NO
+DOT_MULTI_TARGETS      = NO
+GENERATE_LEGEND        = YES
+DOT_CLEANUP            = YES
+#---------------------------------------------------------------------------
+# Configuration::additions related to the search engine   
+#---------------------------------------------------------------------------
+SEARCHENGINE           = NO
diff --git a/Mainpage.dox b/Mainpage.dox
index 591754bba..893e05da4 100644
--- a/Mainpage.dox
+++ b/Mainpage.dox
@@ -1,123 +1,16 @@
 o /** @mainpage Eigen
 
-<h2>Table of contents</h2>
-<a href="#overview">Overview</a><br/>
-<a href="#license">License</a><br/>
-<a href="#features">Features</a><br/>
-<a href="#news">News</a><br/>
-<a href="#download">Download</a><br/>
-<a href="#kde">Relation to KDE</a><br/>
-<a href="#examples">Examples</a><br/>
-<a href="#applications">Applications using Eigen</a><br/>
-<a href="#authors">Authors</a><br/>
-<a href="#contact">Contact us</a><br/>
-<a href="#mailinglist">Mailing list</a><br/>
+<h3>If you see this page, then you have not properly generated the documentation.</h3>
 
-<a name="overview"></a>
-<h2>Overview</h2>
-
-Eigen is a C++ template library for vector and matrix math, a.k.a. linear algebra. It aims to concile speed, ease of use, and completeness.
-
-<a name="license"></a>
-<h2>License</h2>
-
- Eigen is distributed under the GPL, version 2 or later, but with an <a href="#exception">exception allowing any software to use it</a>. Thus, to the question
-"Can my own project use Eigen?", the answer is a definite <b>yes</b>.
-
-Eigen's <a href="#exception">exception</a> is modeled after the one of the GNU C++ Standard Library, but is simpler and more liberal.
-
-This is similar to the LGPL in spirit. The reason why we don't use the LGPL is that, as of version 2, it doesn't make sense for a pure template library like Eigen, where all the code is in headers.
-
-<a name="features"></a>
-<h2>Features</h2>
-
-WARNING: this alpha release is NOT feature complete -- far from it! It contains only the Core module, while several other modules are planned.
-
-<ul>
-  <li>Add items</li>
-  <li>Add more items</li>
-</ul>
-
-<a name="news"></a>
-<h2>News</h2>
-
-If you want to stay informed of Eigen news and releases, please subscribe to our <a href="#mailinglist">mailing list</a>. You can also browse the <a href="http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/">archive</a>.
-
-<a name="download"></a>
-<h2>Download</h2>
-The source code of the latest release is here: <a href="http://download.tuxfamily.org/eigen/eigen-2.0-alpha1.tar.gz">eigen-2.0-alpha1.tar.gz</a><br/>
-
-Alternatively, you can checkout the development tree by anonymous svn, by doing:
-<pre>svn co svn://anonsvn.kde.org/home/kde/branches/work/eigen2</pre>
-or view it online at this address:
-<a href="http://websvn.kde.org/branches/work/eigen2">http://websvn.kde.org/branches/work/eigen2</a>
-
-<a name="kde"></a>
-<h2>Relation to KDE</h2>
-
-First of all: Eigen doesn't have any dependency. In particular, it doesn't depend on any part of KDE or on Qt.<br/>
-
-Eigen is part of the KDE project, in the sense that:
+In order to generate the documentation for Eigen, follow these steps:
 <ul>
-  <li>Its <a href="http://websvn.kde.org/trunk/kdesupport/eigen/">development tree</a> is hosted in the <a href="http://websvn.kde.org">KDE repository</a>.</li>
-  <li>It has been founded by, and is developed by KDE people.</li>
-  <li>It has originally been designed for the needs of KDE applications, especially <a href="http://edu.kde.org/kalzium">Kalzium</a>.</li>
+  <li>make sure you have the required software installed: cmake, doxygen, and a C++ compiler.
+  <li>create a new directory, which we will call the "build directory", outside of the Eigen source directory.</li>
+  <li>enter the build directory</li>
+  <li>configure the project: <pre>cmake -DBUILD_DOC=ON /path/to/source/directory</pre></li>
+  <li>now generate the documentaion: <pre>make</pre> or, if you have two CPUs, <pre>make -j2</pre> Note that this will compile the examples, run them, and integrate their output into the documentation. This is why it can take some time.</li>
 </ul>
-However, we quickly realized that Eigen could be useful for non-KDE projects, whence our decision to make sure that it has no dependency on KDE or Qt.
-
-Although Eigen itself doesn't have any dependency, the unit-tests require Qt.
-
-<a name="examples"></a>
-<h2>Examples</h2>
-
-TODO: write more examples, update this section.
-
-<a name="applications"></a>
-<h2>Applications using Eigen</h2>
-
-TODO: update this section
-
-Please tell us if you know of other interesting projects using Eigen!
-
-<a name="authors"></a>
-<h2>Authors</h2>
-
-<b>Lead Developer:</b> Benoit Jacob (jacob at math jussieu fr)
-
-<b>Contributors during the Eigen 2 development process:</b>
-<ul>
-  <li>Michael Olbrich (michael olbrich at gmx net) : initial loop-unrolling metaprogram</li>
-  <li>Christian Mayer (mail at christianmayer de) : reviewed the source code, made many useful suggestions</li>
-  <li>and thanks to everyone on the <a href="#mailinglist">mailing list</a> for your input!
-</ul>
-
-<a name="contact"></a>
-<h2>Contact us</h2>
-
-The best way to contact us is by means of our <a href="#mailinglist">mailing list</a>.<br/>
-IRC Channel: \#eigen on Freenode.<br/>
-Website (you're here): <a href="http://eigen.tuxfamily.org">http://eigen.tuxfamily.org</a><br/>
-
-<a name="mailinglist"></a>
-<h2>Mailing list</h2>
-
-The Mailing list for Eigen is: eigen at lists tuxfamily org.<br/>
-
-To subscribe, send a mail with subject "subscribe" to eigen-request at lists tuxfamily org.<br/>
-To unsubscribe, send a mail with subject "unsubscribe" to eigen-request at lists tuxfamily org.<br/>
-
-You can also browse the <a href="http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/">archive</a>.
 
-<a name="exception"></a>
-<h2>Exception to the GPL</h2>
-Eigen is licensed under the GNU GPL, version 2 or later, plus the following exception, which is replicated into each of the source files of Eigen:
-<pre>
-// As a special exception, if other files instantiate templates or use macros
-// or inline functions from this file, or you compile this file and link it
-// with other works to produce a work based on this file, this file does not
-// by itself cause the resulting work to be covered by the GNU General Public
-// License. This exception does not invalidate any other reasons why a work
-// based on this file might be covered by the GNU General Public License.
-</pre>
+You will now find in the build directory a 'html' subdirectory containing the HTML documentation for Eigen.
 
 */
diff --git a/doc/CMakeLists.txt b/doc/CMakeLists.txt
index 7b236a27f..66b259498 100644
--- a/doc/CMakeLists.txt
+++ b/doc/CMakeLists.txt
@@ -1,3 +1,4 @@
-add_executable(tutorial tutorial.cpp)
-add_executable(example example.cpp)
+FILE(GLOB examples "*.cpp")
+
+FOREACH(example examples)
 
diff --git a/doc/Mainpage.dox b/doc/Mainpage.dox
new file mode 100644
index 000000000..591754bba
--- /dev/null
+++ b/doc/Mainpage.dox
@@ -0,0 +1,123 @@
+o /** @mainpage Eigen
+
+<h2>Table of contents</h2>
+<a href="#overview">Overview</a><br/>
+<a href="#license">License</a><br/>
+<a href="#features">Features</a><br/>
+<a href="#news">News</a><br/>
+<a href="#download">Download</a><br/>
+<a href="#kde">Relation to KDE</a><br/>
+<a href="#examples">Examples</a><br/>
+<a href="#applications">Applications using Eigen</a><br/>
+<a href="#authors">Authors</a><br/>
+<a href="#contact">Contact us</a><br/>
+<a href="#mailinglist">Mailing list</a><br/>
+
+<a name="overview"></a>
+<h2>Overview</h2>
+
+Eigen is a C++ template library for vector and matrix math, a.k.a. linear algebra. It aims to concile speed, ease of use, and completeness.
+
+<a name="license"></a>
+<h2>License</h2>
+
+ Eigen is distributed under the GPL, version 2 or later, but with an <a href="#exception">exception allowing any software to use it</a>. Thus, to the question
+"Can my own project use Eigen?", the answer is a definite <b>yes</b>.
+
+Eigen's <a href="#exception">exception</a> is modeled after the one of the GNU C++ Standard Library, but is simpler and more liberal.
+
+This is similar to the LGPL in spirit. The reason why we don't use the LGPL is that, as of version 2, it doesn't make sense for a pure template library like Eigen, where all the code is in headers.
+
+<a name="features"></a>
+<h2>Features</h2>
+
+WARNING: this alpha release is NOT feature complete -- far from it! It contains only the Core module, while several other modules are planned.
+
+<ul>
+  <li>Add items</li>
+  <li>Add more items</li>
+</ul>
+
+<a name="news"></a>
+<h2>News</h2>
+
+If you want to stay informed of Eigen news and releases, please subscribe to our <a href="#mailinglist">mailing list</a>. You can also browse the <a href="http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/">archive</a>.
+
+<a name="download"></a>
+<h2>Download</h2>
+The source code of the latest release is here: <a href="http://download.tuxfamily.org/eigen/eigen-2.0-alpha1.tar.gz">eigen-2.0-alpha1.tar.gz</a><br/>
+
+Alternatively, you can checkout the development tree by anonymous svn, by doing:
+<pre>svn co svn://anonsvn.kde.org/home/kde/branches/work/eigen2</pre>
+or view it online at this address:
+<a href="http://websvn.kde.org/branches/work/eigen2">http://websvn.kde.org/branches/work/eigen2</a>
+
+<a name="kde"></a>
+<h2>Relation to KDE</h2>
+
+First of all: Eigen doesn't have any dependency. In particular, it doesn't depend on any part of KDE or on Qt.<br/>
+
+Eigen is part of the KDE project, in the sense that:
+<ul>
+  <li>Its <a href="http://websvn.kde.org/trunk/kdesupport/eigen/">development tree</a> is hosted in the <a href="http://websvn.kde.org">KDE repository</a>.</li>
+  <li>It has been founded by, and is developed by KDE people.</li>
+  <li>It has originally been designed for the needs of KDE applications, especially <a href="http://edu.kde.org/kalzium">Kalzium</a>.</li>
+</ul>
+However, we quickly realized that Eigen could be useful for non-KDE projects, whence our decision to make sure that it has no dependency on KDE or Qt.
+
+Although Eigen itself doesn't have any dependency, the unit-tests require Qt.
+
+<a name="examples"></a>
+<h2>Examples</h2>
+
+TODO: write more examples, update this section.
+
+<a name="applications"></a>
+<h2>Applications using Eigen</h2>
+
+TODO: update this section
+
+Please tell us if you know of other interesting projects using Eigen!
+
+<a name="authors"></a>
+<h2>Authors</h2>
+
+<b>Lead Developer:</b> Benoit Jacob (jacob at math jussieu fr)
+
+<b>Contributors during the Eigen 2 development process:</b>
+<ul>
+  <li>Michael Olbrich (michael olbrich at gmx net) : initial loop-unrolling metaprogram</li>
+  <li>Christian Mayer (mail at christianmayer de) : reviewed the source code, made many useful suggestions</li>
+  <li>and thanks to everyone on the <a href="#mailinglist">mailing list</a> for your input!
+</ul>
+
+<a name="contact"></a>
+<h2>Contact us</h2>
+
+The best way to contact us is by means of our <a href="#mailinglist">mailing list</a>.<br/>
+IRC Channel: \#eigen on Freenode.<br/>
+Website (you're here): <a href="http://eigen.tuxfamily.org">http://eigen.tuxfamily.org</a><br/>
+
+<a name="mailinglist"></a>
+<h2>Mailing list</h2>
+
+The Mailing list for Eigen is: eigen at lists tuxfamily org.<br/>
+
+To subscribe, send a mail with subject "subscribe" to eigen-request at lists tuxfamily org.<br/>
+To unsubscribe, send a mail with subject "unsubscribe" to eigen-request at lists tuxfamily org.<br/>
+
+You can also browse the <a href="http://listengine.tuxfamily.org/lists.tuxfamily.org/eigen/">archive</a>.
+
+<a name="exception"></a>
+<h2>Exception to the GPL</h2>
+Eigen is licensed under the GNU GPL, version 2 or later, plus the following exception, which is replicated into each of the source files of Eigen:
+<pre>
+// As a special exception, if other files instantiate templates or use macros
+// or inline functions from this file, or you compile this file and link it
+// with other works to produce a work based on this file, this file does not
+// by itself cause the resulting work to be covered by the GNU General Public
+// License. This exception does not invalidate any other reasons why a work
+// based on this file might be covered by the GNU General Public License.
+</pre>
+
+*/
diff --git a/doc/examples/function_dynBlock.cpp b/doc/examples/function_dynBlock.cpp
index 7a7e1b320..767157433 100644
--- a/doc/examples/function_dynBlock.cpp
+++ b/doc/examples/function_dynBlock.cpp
@@ -8,12 +8,3 @@ int main(int, char**)
     cout << m << endl;
     return 0;
 }
-
-/* Output:
-
-1 0 0 0
-0 1 0 0
-1 0 1 0
-0 1 0 1
-
-*/