\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{Ryan Johnson (CITguy)}
\pdfinfo{
  /Title (extending-ruby-with-c-part-1.pdf)
  /Creator (Cheatography)
  /Author (Ryan Johnson (CITguy))
  /Subject (Extending Ruby with C - Part 1 Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{CC0000}
\definecolor{LightBackground}{HTML}{FBEFEF}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Extending Ruby with C - Part 1 Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Ryan Johnson (CITguy)} via \textcolor{DarkBackground}{\uline{cheatography.com/138/cs/248/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Ryan Johnson (CITguy) \\
  \uline{cheatography.com/citguy} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 15th February, 2012.\\
   Updated 13th May, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ruby C - Define Objects}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_define\_class}}(char *name, V superclass)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines new class at top level with given {\emph{name}} and {\emph{superclass}}.} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_define\_module}}(char *name)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines new module at top level with given {\emph{name}}.} \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_define\_class\_under}}(V under, char *name, V superclass)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines nested class under class or module {\emph{under}}.} \tn 
% Row Count 10 (+ 4)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_define\_module\_under}}(V parent, V module)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines nested module under class or module {\emph{under}}.} \tn 
% Row Count 13 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_include\_module}}(V parent, V module)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Includes given {\emph{module}} into class or module {\emph{parent}}.} \tn 
% Row Count 16 (+ 3)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_extend\_object}}(V obj, V module)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Extends {\emph{obj}} with {\emph{module}}.} \tn 
% Row Count 18 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_require}}(const char *name)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Equiv. to "require *name." Returns Qtrue or Qfalse.} \tn 
% Row Count 21 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{V = VALUE}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\columnbreak
\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ruby C - Calling Methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_funcall}}(V recv, ID id, int argc, ...)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Invokes method given by {\emph{id}} in object {\emph{recv}} with given number of args {\emph{argc}} and args themselves.} \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_funcall2}}(V recv, ID id, int argc, V *args)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Invokes method given by {\emph{id}} in object {\emph{recv}} with given number of args {\emph{argc}} and args themselves given in C array {\emph{args}}.} \tn 
% Row Count 9 (+ 5)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_funcall3}}(V recv, ID id, int argc, V *args)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Same as {\emph{rb\_funcall2}}, but will not call private methods.} \tn 
% Row Count 13 (+ 4)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_apply}}(V recv, ID name, int argc, V args)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Invokes method given by {\emph{id}} in object {\emph{recv}} with given number of args {\emph{argc}} and the args themselves given in Ruby Array {\emph{args}}.} \tn 
% Row Count 17 (+ 4)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{ID {\bf{rb\_intern}}(char *name)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Returns ID for given {\emph{name}}. If name does not exist, a symbol table entry will be created for it.} \tn 
% Row Count 21 (+ 4)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{char * {\bf{rb\_id2name}}(ID id)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Returns a name for the given {\emph{id}}.} \tn 
% Row Count 23 (+ 2)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{V {\bf{rb\_call\_super}}(int argc, V *args)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Calls current method in superclass of current object.} \tn 
% Row Count 26 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{V = VALUE}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ruby C - Object Status}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{OBJ\_TAINT}}(VALUE obj)} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{{\bf{OBJ\_FREEZE}}(VALUE obj)} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{int {\bf{OBJ\_TAINTED}}(VALUE obj) =\textgreater{} 0|nonzero} \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{int {\bf{OBJ\_FROZEN}}(VALUE obj) =\textgreater{} 0|nonzero} \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ruby C - Defining Variables and Constants}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_const}}(VALUE classmod, char *name, VALUE value)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines constant in class or module {\emph{classmod}}, with given {\emph{name}} and {\emph{value}}.} \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_global\_const}}(char *name, VALUE value)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines global constant with given {\emph{name}} and {\emph{value}}.} \tn 
% Row Count 8 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_variable}}(const char *name, VALUE *object)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Exports address of given {\emph{object}} that was created in C, to the Ruby namespace as {\emph{name}}. To Ruby, this will be a global variable, so {\emph{name}} should have "\$" prefix. Be sure to honor Ruby's rules for allowed variable names.} \tn 
% Row Count 15 (+ 7)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_class\_variable}}(VALUE class, const char *name, VALUE val)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines class variable {\emph{name}} (must specify "@@" prefix) in given {\emph{class}}, initialized to {\emph{value}}.} \tn 
% Row Count 20 (+ 5)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_virtual\_variable}}(const char *name, VALUE (*getter)(), void (*setter)())} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Exports virtual variable to Ruby namespace as global {\emph{\$name}}. No actual storage exists for variable; attempts to get/set value will call the appropriate functions.} \tn 
% Row Count 26 (+ 6)
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_hooked\_variable}}(const cahr *name, VALUE *variable, VALUE (*getter)(), void (*setter)())} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines functions to be called when reading/writing to {\emph{variable}}. (See also {\bf{rb\_define\_virtual\_variable}}.)} \tn 
% Row Count 32 (+ 6)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ruby C - Defining Variables and Constants (cont)}}  \tn
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_readonly\_variable}}(const char *name, VALUE *value)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Same as rb\_define\_variable, but read-only from Ruby.} \tn 
% Row Count 4 (+ 4)
% Row 7
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_attr}}(VALUE variable, const char *name, int read, int write)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Creates accessor methods for given {\emph{variable}}, with given {\emph{name}}. If {\emph{read}} is nonzero, crate read method; if {\emph{write}} is nonzero, create write method.} \tn 
% Row Count 10 (+ 6)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_global\_variable}}(VALUE *obj)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Registers given address with garbage collector.} \tn 
% Row Count 12 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ruby C - Security Status}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{{\bf{Check\_SafeStr}}(VALUE str)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Raises SecurityError if current safe level \textgreater{} 0 and {\emph{str}} is tainted, or a TypeError if {\emph{str}} is not a T\_STRING.} \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{int {\bf{rb\_safe\_level}}()} \tn 
% Row Count 5 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_secure}}(int level)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Raises SecurityError if {\emph{level}} \textless{}= current safe level.} \tn 
% Row Count 8 (+ 3)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_set\_safe\_level}}(int newlevel)} \tn 
% Row Count 9 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ruby C - Defining Methods}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_method}}(V classmod, char *name, V (*func)(), int argc);} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines instance method in class or module {\emph{classmod}} with given {\emph{name}}, implemented by C function {\emph{func}} and taking {\emph{argc}} args. {\emph{({\bf{See Ruby C - Function Prototype}})}}} \tn 
% Row Count 6 (+ 6)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_module\_function}}(V classmod, char *name, V (*func)(), int argc);} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines method in class {\emph{classmod}} with given {\emph{name}}, implemented by C function {\emph{func}} taking {\emph{argc}} args.} \tn 
% Row Count 11 (+ 5)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_global\_function}}(char *name, V (*func)(), int argc);} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines global function (private Kernel method) with given {\emph{name}}, implemented by C function {\emph{func}} and taking {\emph{argc}} args.} \tn 
% Row Count 16 (+ 5)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_singleton\_method}}(V classmod, char *name, V (*func)(), int argc);} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines singleton method in class {\emph{classmod}} with given {\emph{name}}, implemented by C function {\emph{func}} taking {\emph{argc}} args.} \tn 
% Row Count 21 (+ 5)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{int {\bf{rb\_scan\_args}}(int argc, V *argv, char *fmt, ...)} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Scans argument list and assigns to variables similar to scanf: {\emph{fmt}} is string containing zero, one, or two digits followed by optional flag chars. First char indicates count of mandatory args; second is count of optional args. A "*" means to pack remaining args into Ruby array. A "\&" means attached code block will be taken and assigned to given variable (Qnil will be assigned if no code block given). After {\emph{fmt}} string, pointers to VALUE are given to which args are assigned.} \tn 
% Row Count 34 (+ 13)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ruby C - Defining Methods (cont)}}  \tn
% Row 5
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_undef\_method}}(V classmod, const char *name);} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Undefines method {\emph{name}} in class or module {\emph{classmod}}.} \tn 
% Row Count 4 (+ 4)
% Row 6
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{void {\bf{rb\_define\_alias}}(V classmod, const char *newname, const char *oldname);} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}Defines alias for {\emph{oldname}} in class or module {\emph{classmod}}.} \tn 
% Row Count 8 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{V = VALUE}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Ruby C - Function Prototype}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{(argc) {\bf{0..17}} VALUE func({\emph{VALUE self, VALUE arg...}})} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}C function will be called with this many arguments.} \tn 
% Row Count 4 (+ 4)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{(argc) {\bf{-1}} VALUE func({\emph{int argc, VALUE *argv, VALUE self}})} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}C function will be given a variable number of arguments passed as a C array.} \tn 
% Row Count 8 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{(argc) {\bf{-2}} VALUE func({\emph{VALUE self, VALUE args}})} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}C function will be given a variable number of arguments passed as a Ruby array.} \tn 
% Row Count 11 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}