'\"
'\" Generated from file 'critcl_literals\&.man' by tcllib/doctools with format 'nroff'
'\" Copyright (c) 2011-2018 Andreas Kupries
'\"
.TH "critcl::literals" 3tcl 1\&.3 doc "C Runtime In Tcl (CriTcl)"
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.SH NAME
critcl::literals \- CriTcl Utilities: Constant string pools
.SH SYNOPSIS
package require \fBTcl  8\&.4\fR
.sp
package require \fBcritcl  ?3\&.1\&.11?\fR
.sp
package require \fBcritcl::literals  ?1\&.3?\fR
.sp
\fB::critcl::literals::def\fR \fIname\fR \fIdefinition\fR ?\fImode\fR?
.sp
.BE
.SH DESCRIPTION
.PP
\fIC Runtime In Tcl\fR, or \fICriTcl\fR , is a system for compiling C code
embedded in Tcl on the fly and either loading the resulting objects into Tcl for
immediate use or packaging them for distribution\&.  Use \fICriTcl\fR to improve
performance by rewriting in C those routines that are performance bottlenecks\&.
.PP
This document is the reference manpage for the
\fBcritcl::literals\fR package\&. This package provides convenience
commands for advanced functionality built on top of both critcl core
and package \fBcritcl::iassoc\fR\&.
.PP
Many packages will have a fixed set of string constants
occuring in one or places\&. Most of them will be coded to create a new
string \fBTcl_Obj*\fR from a C \fBchar*\fR every time the constant
is needed, as this is easy to to, despite the inherent waste of
memory\&.
.PP
This package was written to make declaration and management of
string pools which do not waste memory as easy as the wasteful
solution, hiding all attendant complexity from the user\&.
.PP
Its intended audience are mainly developers wishing to write
Tcl packages with embedded C code\&.
.PP
This package resides in the Core Package Layer of CriTcl\&.
.PP
.PS
.nf
+----------------+
|Applications    |
| critcl         |
| critcl::app    |
+----------------+

*================*
|Core Packages   |
| critcl         |
| critcl::util   |
*================*

+----------------+
|Support Packages|
| stubs::*       |
| md5, platform  |
|  \&.\&.\&.           |
+----------------+

.fi
.PE
.PP
.SH API
.TP
\fB::critcl::literals::def\fR \fIname\fR \fIdefinition\fR ?\fImode\fR?
This command defines a C function with the given \fIname\fR which
provides access to a pool of constant strings with a Tcl interpreter\&.
.sp
The \fIdefinition\fR dictionary provides the mapping from the
C-level symbolic names to the string themselves\&.
.sp
The \fImode\fR-list configures the output somewhat\&.
The three allowed modes are \fBc\fR, \fB+list\fR and \fBtcl\fR\&.
All modes can be used together\&.
The default mode is \fBtcl\fR\&.
Using mode \fB+list\fR implies \fBtcl\fR as well\&.
.sp
For mode \fBtcl\fR the new function has two arguments, a
\fBTcl_Interp*\fR pointer refering to the interpreter holding the
string pool, and a code of type "\fIname\fR_names" (see below), the
symbolic name of the literal to return\&. The result of the function is
a \fBTcl_Obj*\fR pointer to the requested string constant\&.
.sp
For mode \fBc\fR the new function has one argument, a code of
type "\fIname\fR_names" (see below), the symbolic name of the literal
to return\&. The result of the function is a \fBconst char*\fR
pointer to the requested string constant\&.
.sp
For mode \fB+list\fR all of \fBtcl\fR applies, plus an
additional function is generated which takes three arguments, in
order, a \fBTcl_Interp*\fR pointer refering to the interpreter
holding the string pool, an \fBint\fR holding the size of the last
argument, and an array of type "\fIname\fR_names" holding the codes
(see below), the symbolic names of the literals to return\&. The result
of the function is a \fBTcl_Obj*\fR pointer to a Tcl list holding the
requested string constants\&.
.sp
The underlying string pool is automatically initialized on
first access, and finalized on interpreter destruction\&.
.sp
The package generates multiple things (declarations and
definitions) with names derived from \fIname\fR, which has to be a
proper C identifier\&.
.RS
.TP
\fIname\fR
The mode \fBtcl\fR function providing access to the string pool\&.
Its signature is
.sp
.CS


Tcl_Obj* \fIname\fR (Tcl_Interp* interp, \fIname\fR_names literal);

.CE
.TP
\fIname\fR_list
The mode \fB+list\fR function providing multi-access to the string pool\&.
Its signature is
.sp
.CS


Tcl_Obj* \fIname\fR_list (Tcl_Interp* interp, int c, \fIname\fR_names* literal);

.CE
.TP
\fIname\fR_cstr
The mode \fBc\fR function providing access to the string pool\&.
Its signature is
.sp
.CS


const char* \fIname\fR_cstr (\fIname\fR_names literal);

.CE
.TP
\fIname\fR_names
A C enumeration type containing the symbolic names of the strings
provided by the pool\&.
.TP
\fIname\fR\&.h
A header file containing the declarations for the accessor functions
and the enumeration type, for use by other parts of the system, if
necessary\&.
.sp
The generated file is stored in a place where it will not
interfere with the overall system outside of the package, yet also be
available for easy inclusion by package files (\fBcsources\fR)\&.
.TP
\fIname\fR
\fINew in version 1\&.1\fR:
For mode \fBtcl\fR the command registers a new result-type for
\fBcritcl::cproc\fR with critcl, which takes an integer result from
the function and converts it to the equivalent string in the pool for
the script\&.
.RE
.PP
.SH EXAMPLE
The example shown below is the specification of the string pool pulled
from the draft work on a Tcl binding to Linux's inotify APIs\&.
.CS


package require Tcl 8\&.5
package require critcl 3\&.1\&.11

critcl::buildrequirement {
    package require critcl::literals
}

critcl::literals::def tcl_inotify_strings {
    w_create	"create"
    w_directory	"directory"
    w_events	"events"
    w_file	"file"
    w_handler	"handler"
    w_remove	"remove"
} {c tcl}

# Declarations: tcl_inotify_strings\&.h
# Type:         tcl_inotify_strings_names
# Accessor:     Tcl_Obj*    tcl_inotify_strings      (Tcl_Interp*               interp,
#                                                     tcl_inotify_strings_names literal);
# Accessor:     const char* tcl_inotify_strings_cstr (tcl_inotify_strings_names literal);
# ResultType:   tcl_inotify_strings

.CE
.SH AUTHORS
Andreas Kupries
.SH "BUGS, IDEAS, FEEDBACK"
This document, and the package it describes, will undoubtedly contain
bugs and other problems\&.
Please report such at \fIhttps://github\&.com/andreas-kupries/critcl\fR\&.
Please also report any ideas for enhancements you may have for either
package and/or documentation\&.
.SH KEYWORDS
C code, Embedded C Code, Tcl Interp Association, code generator, compile & run, compiler, dynamic code generation, dynamic compilation, generate package, linker, literal pool, on demand compilation, on-the-fly compilation, singleton, string pool
.SH CATEGORY
Glueing/Embedded C code
.SH COPYRIGHT
.nf
Copyright (c) 2011-2018 Andreas Kupries

.fi