You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
450 lines
10 KiB
450 lines
10 KiB
.TH tqmoc 1 "24 June 2001" "Trolltech AS" \" -*- nroff -*-
|
|
.\"
|
|
.\" $Id: qt/moc.1 3.3.8 edited Jan 11 14:38 $
|
|
.\"
|
|
.\" Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
|
|
.\"
|
|
.\" This file is part of TQt and may be distributed and used according to
|
|
.\" the terms and conditions described in the LICENSE file.
|
|
.\"
|
|
.nh
|
|
.SH NAME
|
|
tqmoc \- generate TQt meta object support code
|
|
.SH SYNOPSIS
|
|
.B tqmoc
|
|
[-o file] [-i] [-f] [-k] [-ldbg] [-nw] [-p path] [-q path] [-v] file
|
|
.SH DESCRIPTION
|
|
This page documents the
|
|
.B Meta Object Compiler
|
|
for the TQt GUI application framework. The
|
|
.B tqmoc
|
|
reads one or more C++ class declarations from a C++ header or source
|
|
file and generates one C++ source file containing meta object
|
|
information for the classes. The C++ source file generated by the
|
|
.B tqmoc
|
|
must be compiled and linked with the implementation of the class (or it
|
|
can be #included into the class's source file).
|
|
.PP
|
|
If you use
|
|
.B tqmake
|
|
to create your Makefiles, build rules will be included that call the
|
|
.B tqmoc
|
|
when required, so you will not need to use the
|
|
.B tqmoc
|
|
directly.
|
|
.PP
|
|
In brief, the meta object system is a structure used by TQt (see
|
|
.BR http://doc.trolltech.com ")"
|
|
for component programming and run time type information. It adds
|
|
properties and inheritance information to (some) classes and
|
|
provides a new type of communication between those instances of those
|
|
classes, signal-slot
|
|
connections.
|
|
.SH OPTIONS
|
|
.TP
|
|
.I "-o file"
|
|
Write output to
|
|
.I file
|
|
rather than to stdout.
|
|
.TP
|
|
.I -f
|
|
Force the generation of an #include statement in the output.
|
|
This is the default for files whose name matches the regular
|
|
expression .[hH][^.]* (i.e. the extension starts with
|
|
.B H
|
|
or
|
|
.B h
|
|
). This
|
|
option is only useful if you have header files that do not follow the
|
|
standard naming conventions.
|
|
.TP
|
|
.I "-i"
|
|
Do not generate an #include statement in the output. This may be used
|
|
to run
|
|
.B tqmoc
|
|
on a C++ file containing one or more class declarations. You should then
|
|
#include the meta object code in the .cpp file (see USAGE below). If both
|
|
.I -f
|
|
and
|
|
.I -i
|
|
are present, the last one wins.
|
|
.TP
|
|
.I "-nw"
|
|
Do not generate any warnings. Not recommended.
|
|
.TP
|
|
.I "-ldbg"
|
|
Write a flood of lex debug information to stdout.
|
|
.TP
|
|
.I "-p path"
|
|
Makes
|
|
.B tqmoc
|
|
prepend
|
|
.IR path /
|
|
to the file name in the generated #include statement (if one is generated).
|
|
.TP
|
|
.I "-q path"
|
|
Makes
|
|
.B tqmoc
|
|
prepend
|
|
.IR path /
|
|
to the file name of qt #include files in the generated code.
|
|
.TP
|
|
.I "-v"
|
|
Displays the version of
|
|
.B tqmoc
|
|
and TQt.
|
|
.PP
|
|
You can explicitly tell the
|
|
.B tqmoc
|
|
not to parse parts of a header
|
|
file. It recognizes any C++ comment (//) that contains the substrings
|
|
MOC_SKIP_BEGIN or MOC_SKIP_END. They work as you would expect and you
|
|
can have several levels of them. The net result as seen by the
|
|
.B tqmoc
|
|
is as if you had removed all lines between a MOC_SKIP_BEGIN and a
|
|
MOC_SKIP_END
|
|
.SH USAGE
|
|
.B tqmoc
|
|
is almost always invoked by
|
|
.BR make (1),
|
|
not by hand.
|
|
.PP
|
|
.B tqmoc
|
|
is typically used with an input file containing class declarations
|
|
like this:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class YourClass : public TQObject {
|
|
TQ_OBJECT
|
|
TQ_PROPERTY( ... )
|
|
TQ_CLASSINFO( ... )
|
|
|
|
public:
|
|
YourClass( TQObject * parent=0, const char * name=0 );
|
|
~YourClass();
|
|
|
|
signals:
|
|
|
|
public slots:
|
|
|
|
};
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
Here is a useful makefile rule if you only use GNU make:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
m%.cpp: %.h
|
|
tqmoc $< -o $@
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
If you want to write portably, you can use individual rules of the
|
|
following form:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
mNAME.cpp: NAME.h
|
|
tqmoc $< -o $@
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
You must also remember to add
|
|
.I mNAME.cpp
|
|
to your SOURCES (substitute your favorite name) variable and
|
|
.I mNAME.o
|
|
to your OBJECTS variable.
|
|
.PP
|
|
(While we prefer to name our C++ source files .cpp, the
|
|
.B tqmoc
|
|
doesn't know that, so you can use .C, .cc, .CC, .cxx or even .c++ if
|
|
you prefer.)
|
|
.PP
|
|
If you have class declarations in C++ files, we recommend that you use
|
|
a makefile rule like this:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
NAME.o: mNAME.cpp
|
|
|
|
mNAME.cpp: NAME.cpp
|
|
tqmoc -i $< -o $@
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
This guarantees that
|
|
.BR make (1)
|
|
will run the
|
|
.B tqmoc
|
|
before it compiles
|
|
.IR NAME.cpp .
|
|
You can then put
|
|
.PP
|
|
.ti +4
|
|
#include "nNAME.cpp"
|
|
.PP
|
|
at the end of
|
|
.IR NAME.cpp ,
|
|
where all the classes declared in that file are fully known.
|
|
.SH DIAGNOSTICS
|
|
Sometimes you may get linkage errors, saying that
|
|
YourClass::className() is undefined or that YourClass lacks a vtbl.
|
|
Those errors happen most often when you forget to compile the
|
|
tqmoc-generated C++ code or include that object file in the link
|
|
command.
|
|
.PP
|
|
The
|
|
.B tqmoc
|
|
will warn you about a number of dangerous or illegal constructs.
|
|
.SH BUGS
|
|
|
|
The
|
|
.B tqmoc
|
|
does not expand #include or #define, it simply skips any preprocessor
|
|
directives it encounters. This is regrettable, but is normally not a
|
|
problem in practice.
|
|
|
|
The
|
|
.B tqmoc
|
|
does not handle all of C++. The main problem is that class templates
|
|
cannot have signals or slots. This is an important bug. Here is an
|
|
example:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class SomeTemplate<int> : public TQFrame {
|
|
TQ_OBJECT
|
|
....
|
|
signals:
|
|
void bugInMocDetected( int );
|
|
};
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
Less importantly, the following constructs are illegal. All of them
|
|
have have alternatives which we think are usually better, so removing
|
|
these limitations is not a high priority for us.
|
|
.SS "Multiple inheritance requires TQObject to be first."
|
|
If you are using multiple inheritance,
|
|
.B tqmoc
|
|
assumes that the
|
|
.B first
|
|
inherited class is a subclass of TQObject. Also, be sure that
|
|
.B only
|
|
the first inherited class is a TQObject.
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class SomeClass : public TQObject, public OtherClass {
|
|
...
|
|
};
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
This bug is almost impossible to fix; since the
|
|
.B tqmoc
|
|
does not expand
|
|
#include or #define, it cannot find out which one of the base classes is a
|
|
TQObject.
|
|
.SS "Function pointers cannot be arguments to signals or slots."
|
|
In most cases where you would consider that, we think inheritance is a
|
|
better alternative. Here is an example of illegal syntax:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class SomeClass : public TQObject {
|
|
TQ_OBJECT
|
|
...
|
|
public slots:
|
|
// illegal
|
|
void apply( void (*apply)(List *, void *), void * );
|
|
};
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
You can work around this restriction like this:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
typedef void (*ApplyFunctionType)( List *, void * );
|
|
|
|
class SomeClass : public TQObject {
|
|
TQ_OBJECT
|
|
...
|
|
public slots:
|
|
void apply( ApplyFunctionType, char * );
|
|
};
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
It may sometimes be even better to replace the function pointer with
|
|
inheritance and virtual functions, signals or slots.
|
|
.SS "Friend declarations cannot be placed in signals or slots sections"
|
|
Sometimes it will work, but in general, friend declarations cannot be
|
|
placed in
|
|
.B signals
|
|
or
|
|
.B slots
|
|
sections. Put them in the good old
|
|
.BR private ", " protected
|
|
or
|
|
.B public
|
|
sections instead. Here is an example of the illegal syntax:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class SomeClass : public TQObject {
|
|
TQ_OBJECT
|
|
...
|
|
signals:
|
|
friend class ClassTemplate<char>; // illegal
|
|
};
|
|
.fi
|
|
.in -4
|
|
.SS "Signals and slots cannot be upgraded"
|
|
The C++ feature of upgrading an inherited member function to
|
|
.B public
|
|
status is not extended to cover signals and slots. Here is an illegal
|
|
example:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class Whatever : public TQButtonGroup {
|
|
...
|
|
public slots:
|
|
TQButtonGroup::buttonPressed; // illegal
|
|
...
|
|
};
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
The TQButtonGroup::buttonPressed() slot is protected.
|
|
.PP
|
|
C++ quiz: What happens if you try to upgrade a protected member
|
|
function which is overloaded?
|
|
.IP
|
|
- All the functions are upgraded.
|
|
.IP
|
|
- That is not legal C++.
|
|
.\" Good idea, but look in the SEE ALSO section...
|
|
.SS "Type macros cannot be used for signal and slot arguments"
|
|
|
|
Since the
|
|
.B tqmoc
|
|
does not expand #define, type macros that take an argument
|
|
will not work in signals and slots. Here is an illegal example:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
#ifdef ultrix
|
|
#define SIGNEDNESS(a) unsigned a
|
|
#else
|
|
#define SIGNEDNESS(a) a
|
|
#endif
|
|
class Whatever : public TQObject {
|
|
...
|
|
signals:
|
|
void someSignal( SIGNEDNESS(int) ); // illegal
|
|
};
|
|
.PP
|
|
A #define without arguments works.
|
|
.fi
|
|
.in -4
|
|
.SS "Nested classes cannot be in the signals or slots sections nor have signals or slots"
|
|
Here's an example:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class A {
|
|
TQ_OBJECT
|
|
public:
|
|
class B {
|
|
public slots: // illegal
|
|
void b();
|
|
...
|
|
};
|
|
signals:
|
|
class B { // illegal
|
|
void b();
|
|
...
|
|
}:
|
|
};
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
.SS "Constructors cannot be used in signals or slots sections"
|
|
It is a mystery to us why anyone would put a constructor on either the
|
|
.B signals
|
|
or
|
|
.B slots
|
|
sections. You can't, anyway (except that it happens to work in some
|
|
cases). Put them in
|
|
.BR private ", " protected
|
|
or
|
|
.B public
|
|
sections, where they belong. Here is an example of the illegal syntax:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class SomeClass : public TQObject {
|
|
TQ_OBJECT
|
|
public slots:
|
|
SomeClass( TQObject *parent, const char *name )
|
|
: TQObject( parent, name ) {} // illegal
|
|
...
|
|
};
|
|
.fi
|
|
.in -4
|
|
.SS "Properties need to be declared before the public section that contains the respective get and set functions"
|
|
.PP
|
|
Declaring the first property within or after the public section that
|
|
contains the type definition and the respective get and set functions
|
|
does not work as expected. The
|
|
.B tqmoc
|
|
will complain that it can neither
|
|
find the functions nor resolve the type. Here is an example of the
|
|
illegal syntax:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class SomeClass : public TQObject {
|
|
TQ_OBJECT
|
|
public:
|
|
...
|
|
// illegal
|
|
TQ_PROPERTY( Priority priority READ priority WRITE setPriority )
|
|
TQ_ENUMS( Priority )
|
|
enum Priority { High, Low, VeryHigh, VeryLow };
|
|
void setPriority( Priority );
|
|
Priority priority() const;
|
|
...
|
|
};
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
Work around this limitation by declaring all properties at the
|
|
beginning of the class declaration, right after TQ_OBJECT:
|
|
.PP
|
|
.in +4
|
|
.nf
|
|
class SomeClass : public TQObject {
|
|
TQ_OBJECT
|
|
TQ_PROPERTY( Priority priority READ priority WRITE setPriority )
|
|
TQ_ENUMS( Priority )
|
|
public:
|
|
...
|
|
enum Priority { High, Low, VeryHigh, VeryLow };
|
|
void setPriority( Priority );
|
|
Priority priority() const;
|
|
...
|
|
};
|
|
.fi
|
|
.in -4
|
|
.PP
|
|
.SH "SEE ALSO"
|
|
.BR http://www.trolltech.com ", "
|
|
.BR "C++ ARM, section r.11.3" " (for the answer to the quiz), and"
|
|
.BR http://doc.trolltech.com " (for complete TQt documentation)."
|