source: doc/uC++toCFA/uC++toCFA.tex@ 46f9f02

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%%
%% Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
%%
%% The contents of this file are covered under the licence agreement in the
%% file "LICENCE" distributed with Cforall.
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%% user.tex --
%%
%% Author           : Peter A. Buhr
%% Created On       : Wed Apr  6 14:53:29 2016
%% Last Modified By : Peter A. Buhr
%% Last Modified On : Sun Sep 17 09:10:12 2023
%% Update Count     : 5883
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\input{common}                                                                                  % common CFA document macros
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\newcommand{\uC}{$\mu$\CC}

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\CFAStyle                                                                                               % use default CFA format-style
\lstset{language=CFA}                                                                   % CFA default lnaguage
\lstnewenvironment{C++}[1][]                            % use C++ style
{\lstset{language=C++,escapechar=\$,mathescape=false,moredelim=**[is][\protect\color{red}]{@}{@},#1}}{}
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\title{\vspace*{-0.5in}
\CC/\uC to \CFA Cheat Sheet}
%\author{Peter A. Buhr}
\date{}

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\begin{document}
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\maketitle
\vspace*{-0.55in}

\section{Introduction}

\CFA is NOT an object-oriented programming-language.
\CFA uses parametric polymorphism and allows overloading of variables and routines:
\begin{cfa}
int i;  char i;  double i;              // overload name i
int i();  double i();  char i();
i += 1;                 $\C[1.5in]{// int i}$
i += 1.0;               $\C{// double i}$
i += 'a';               $\C{// char i}$
int j = i();    $\C{// int i()}$
double j = i(); $\C{// double i();}$
char j = i();   $\C{// char i()}\CRT$
\end{cfa}
\CFA has rebindable references.

\begin{cquote}
\begin{tabular}{l|l}
\multicolumn{2}{l}{\lstinline{  int x = 1, y = 2, * p1x = &x, * p1y = &y, ** p2i = &p1x,}} \\
\multicolumn{2}{l}{\lstinline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ && r1x = x, & r1y = y, && r2i = r1x;}} \\
\begin{uC++}
**p2i = 3;
p2i = &p1y;
**p2i = 3;
p1x = p1y;
**p2i = 4;
p1x = @nullptr@;
\end{uC++}
&
\begin{cfa}
r2i = 3; $\C[1.0in]{// change x}$
&r2i = &r1y; $\C{// change p2i / r2i}$
r2i = 3; $\C{// change y}$
&r1x = &r1y; $\C{// change p1x / r1x}$
r2i = 4; $\C{// change y}$
&r1x = @0p@; $\C{// reset}\CRT$
\end{cfa}
\end{tabular}
\end{cquote}
Non-rebindable reference (\CC reference) is a @const@ reference (@const@ pointer).
\begin{cfa}
int & @const@ cr = x; // must initialize, no null pointer
int & @const@ & @const@ crcr = cr; // generalize
\end{cfa}
Aggregate qualification is reduced or eliminated by opening scopes using the @with@ clause.
\begin{cfa}
struct S { int i; int j; double m; };  // field i has same type in structures S and T
struct T { int i; int k; int m; };
void foo( S s, T t ) @with(s, t)@ {   // open structure scope s and t in parallel
        j + k;                          $\C[1.6in]{// unambiguous, s.j + t.k}$
        m = 5.0;                        $\C{// unambiguous, s.m = 5.0}$
        m = 1;                          $\C{// unambiguous, t.m = 1}$
        int a = m;                      $\C{// unambiguous, a = t.m}$
        double b = m;           $\C{// unambiguous, b = s.m}$
        int c = s.i + t.i;      $\C{// unambiguous with qualification}$
        (double)m;                      $\C{// unambiguous with cast s.m}\CRT$
}
\end{cfa}
\noindent
In subsequent code examples, the left example is \CC/\uC and the right example is \CFA.


\section{Looping}

\begin{cquote}
\begin{tabular}{l|l}
\begin{uC++}
for ( ;; ) { ... } / while ( true ) { ... }
for ( int i = 0; i < 10; i += 1 ) { ... }
for ( int i = 5; i < 15; i += 2 ) { ... }
int i = 0
for ( i = 0; i < 10; i += 1 ) { ... }
if ( i == 10 ) { ... }
\end{uC++}
&
\begin{cfa}
for () { ... } / while () { ... }
for ( 10 ) { ... } / for ( i; 10 ) { ... }
for ( i; 5~15~2 ) { ... }

for ( i; 10 ) { ... }
else { ... } // i == 10
\end{cfa}
\end{tabular}
\end{cquote}


\section{Exceptions}

Currently, \CFA uses macros @ExceptionDecl@ and @ExceptionInst@ to declare and instantiate an exception.
\begin{cquote}
\begin{tabular}{l|ll}
\begin{uC++}

struct E {              // local or global scope
        ... // exception fields
};
try {
        ...
        if ( ... ) _Resume E( /* initialization */ );
        if ( ... ) _Throw E( /* initialization */ );
        ...
} _CatchResume( E & ) { // should be reference
        ...
} catch( E & ) {
        ...
}
\end{uC++}
&
\begin{cfa}
#include <Exception.hfa>
@ExceptionDecl@( E,             // must be global scope
        ... // exception fields
);
try {
        ...
        if ( ... ) throwResume @ExceptionInst@( E, /* intialization */ );
        if ( ... ) throw @ExceptionInst@( E, /* intialization */ );
        ...
} catchResume( E * ) { // must be pointer
        ...
} catch( E * ) {
        ...
}
\end{cfa}
\end{tabular}
\end{cquote}


\section{Stream I/O}

\CFA output streams automatically separate values and insert a newline at the end of the print.

\begin{cquote}
\begin{tabular}{l|l}
\begin{uC++}
#include <@iostream@>
using namespace std;
int i;   double d;   char c;
cin >> i >> d >> c;
cout << i << ' ' << d << ' ' << c | endl;
\end{uC++}
&
\begin{cfa}
#include <@fstream.hfa@>

int i;   double d;   char c;
sin | i | d | c;
sout | i | d | c
\end{cfa}
\end{tabular}
\end{cquote}


\section{String}

\begin{cquote}
\begin{tabular}{l|l}
\multicolumn{2}{l}{\lstinline{string s1, s2;}} \\
\begin{uC++}
s1 = "hi";
s2 = s1;
s1 += s2;
s1 == s2; s1 != s2;
s1 < s2; s1 <= s2; s1 > s2; s1 >= s2;
s1.length();
s1[3];
s1.substr( 2 ); s1.substr( 2, 3 );
s1.replace( 2, 5, s2 );
s1.find( s2 ), s1.rfind( s2 );
s1.find_first_of( s2 ); s1.find_last_of( s2 );
s1.find_first_not_of(s2 ); s1.find_last_not_of( s2 );
getline( cin, s1 );
cout << s1 << endl;
\end{uC++}
&
\begin{cfa}
s1 = "hi";
s2 = s1;
s1 += s2;
s1 == s2; s1 != s2;
s1 < s2; s1 <= s2; s1 > s2; s1 >= s2;
size( s1 );
s1[3];
s1( 2 ); s1( 2, 3 );
//s1.replace( 2, 5, s2 );
find( s1, s2 ), rfind( s1, s2 );
find_first_of( .substr, s2 ); s1.find_last_of( s2 );
s1.find_first_not_of(s2 ); s1.find_last_not_of( s2 );
sin | getline( s1 );
sout | s1;
\end{cfa}
\end{tabular}
\end{cquote}


\section{Constructor / Destructor}

\begin{cquote}
\begin{tabular}{l|l}
\begin{uC++}
struct S {
        ... // fields
        @S@(...) { ... }
        @~S@(...) { ... }
};
\end{uC++}
&
\begin{cfa}
struct S {
        ... // fields
};
@?{}@( @S & s,@ ...) { ... }
@^?{}@( @S & s@ ) { ... }
\end{cfa}
\end{tabular}
\end{cquote}


\section{\texorpdfstring{Structures (object-oriented \protect\vs routine style)}{Structures (object-oriented vs. routine style)}}

\begin{cquote}
\begin{tabular}{l|l}
\begin{uC++}
struct S {
        int i = 0;
        int setter( int j ) { int t = i; i = j; return t; }
        int getter() { return i; }
};

S s;
@s.@setter( 3 );  // object-oriented call
int k = @s.@getter();
\end{uC++}
&
\begin{cfa}
struct S {
        int i;
};
void ?{}( S & s ) { s.i = 0; }
int setter( @S & s,@ int j ) @with(s)@ { int t = i; i = j; return t; }
int getter( @S & s@ ) @with(s)@ { return i; }
S s;
setter( @s,@ 3 );  // normal routine call
int k = getter( @s@ );
\end{cfa}
\end{tabular}
\end{cquote}


\section{\texorpdfstring{\lstinline{uNoCtor}}{uNoCtor}}

\begin{cquote}
\begin{tabular}{l|l}
\begin{uC++}
struct S {
        int i;
        S( int i ) { S::i = i; cout << S::i << endl; }
};
@uNoCtor<S>@ s[10];
int main() {
        for ( int i = 0; i < 10; i += 1 ) {
                s[i].ctor( i );
        }
        for ( int i = 0; i < 10; i += 1 ) {
                cout << s[i]@->@i << endl;
        }
}
\end{uC++}
&
\begin{cfa}
struct S {
        int i;
};
void ?{}( S & s, int i ) { s.i = i; sout | s.i; }
S s[10] @$\color{red}@$= {}@;
int main() {
        for ( i; 10 ) {
                ?{}( s[i], i );  // call constructor
        }
        for ( i; 10 ) {
                sout | s[i]@.@i; // dot not arrow
        }
}
\end{cfa}
\end{tabular}
\end{cquote}


\section{Coroutines}

\begin{cquote}
\begin{tabular}{l|ll}
\begin{uC++}

_Coroutine C {
        // private coroutine fields
        void main() {
                ... suspend(); ...
                ... _Resume E( ... ) _At partner;
        }
  public:
        void mem( ... ) {
                ... resume() ...
        }
};
\end{uC++}
&
\begin{cfa}
#include <$coroutine$.hfa>
coroutine C {
        // private coroutine fields

};
void main( C & c ) {
        ... suspend; ... // keyword not routine
        ... resumeAt( partner, ExceptionInst( E, ... ) );
}
void mem( C & c, ... ) {
        ... resume(); ...
}
\end{cfa}
\\
\multicolumn{2}{l}{\lstinline{C c;}}
\end{tabular}
\end{cquote}


\section{Locks}

\begin{cquote}
\begin{tabular}{l|ll}
\begin{uC++}

uOwnerLock m;
uCondLock s;
bool avail = true;
m.acquire();
if ( ! avail ) s.wait( m );
else {
        avail = false;
        m.release();
}
@osacquire( cout )@ << i << endl;
\end{uC++}
&
\begin{cfa}
#include <locks.hfa>
owner_lock m;
condition_variable( owner_lock ) s;
bool avail = true;
lock( m );
if ( ! avail ) wait( s, m );
else {
        avail = false;
        unlock( m );
}
@mutex( sout )@ sout | i;  // safe I/O
\end{cfa}
\end{tabular}
\end{cquote}


\section{Monitors}

\begin{cquote}
\begin{tabular}{l|ll}
\begin{uC++}

@_Monitor@ M {
        @uCondition@ c;
        bool avail = true;
  public:

        void rtn() {
                if ( ! avail ) c.wait();
                else avail = false;
        }
};
\end{uC++}
&
\begin{cfa}
#include <$monitor$.hfa>
@monitor@ M {
        @condition@ c;
        bool avail;
};
void ?{}( M & m ) { m.avail = true; }
void rtn( M & m ) with( m ) {
        if ( ! avail ) wait( c );
        else avail = false;
}

\end{cfa}
\\
\multicolumn{2}{l}{\lstinline{M m;}}
\end{tabular}
\end{cquote}


\section{Threads}

\begin{cquote}
\begin{tabular}{l|ll}
\begin{uC++}

@_Task@ T {
        // private task fields
        void main() {
                ... _Resume E( ... ) _At partner;
        }
  public:
};
\end{uC++}
&
\begin{cfa}
#include <$thread$.hfa>
@thread@ T {
        // private task fields

};
void main( @T & t@ ) {
        ... resumeAt( partner, ExceptionInst( E, ... ) );
}
\end{cfa}
\\
\multicolumn{2}{l}{\lstinline{T t; // start thread in main routine}}
\end{tabular}
\end{cquote}


\input{uC++toCFA.ind}

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