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C++ Mathematical Expression Library (ExprTk) http://www.partow.net/programming/exprtk/index.html

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Arash Partow
2016-10-11 12:46:39 +11:00
parent e7bf0da424
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readme.txt
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@ -2668,7 +2668,81 @@ via the 'unknown symbol resolver' mechanism.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[20 - EXPRTK NOTES]
[20 - RUNTIME LIBRARY PACKAGES]
ExprTk contains a set of simple extensions, that provide
functionalities beyond basic numerical calculations. Currently the
available packages are:
+---+--------------------+-----------------------------------+
| # | Package Name | Namespace/Type |
+---+--------------------+-----------------------------------+
| 1 | Basic I/O | exprtk::rtl::io::package<T> |
| 2 | File I/O | exprtk::rtl::io::file::package<T> |
| 3 | Vector Operations | exprtk::rtl::vecops::package<T> |
+---+--------------------+-----------------------------------+
In order to make the features of a specific package available within
an expression, an instance of the package must be added to the
expression's associated symbol table. In the following example, the
file I/O package is made available for the given expression:
typedef exprtk::symbol_table<T> symbol_table_t;
typedef exprtk::expression<T> expression_t;
typedef exprtk::parser<T> parser_t;
exprtk::rtl::io::file::package<T> fileio_package;
std::string expression_string =
" var file_name := 'file.txt'; "
" var stream := null; "
" "
" stream := open(file_name,'w'); "
" "
" write(stream,'Hello world....\n'); "
" "
" close(stream); "
" ";
symbol_table_t symbol_table;
symbol_table.add_package(fileio_package);
expression_t expression;
expression.register_symbol_table(symbol_table);
parser_t parser;
parser.compile(expression_string,expression);
expression.value();
(1) Basic I/O functions:
(a) print
(b) println
(2) File I/O functions:
(a) open (b) close
(c) write (d) read
(e) getline (f) eof
(3) Vector Operations functions:
(a) all_true (b) all_false
(c) any_true (d) any_false
(e) count (f) copy
(g) rotate-left (h) rotate-right
(i) shift-left (j) shift-right
(k) sort (l) sumk
(m) axpy (n) axpby
(o) axpyz (p) axpbyz
(q) axpbz (r) dot
(s) dotk
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[21 - EXPRTK NOTES]
The following is a list of facts and suggestions one may want to take
into account when using ExprTk:
@ -2869,7 +2943,7 @@ into account when using ExprTk:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[21 - SIMPLE EXPRTK EXAMPLE]
[22 - SIMPLE EXPRTK EXAMPLE]
The following is a simple yet complete example demonstrating typical
usage of the ExprTk Library. The example instantiates a symbol table
object, adding to it three variables named x, y and z, and a custom
@ -2974,7 +3048,7 @@ int main()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[22 - BUILD OPTIONS]
[23 - BUILD OPTIONS]
When building ExprTk there are a number of defines that will enable or
disable certain features and capabilities. The defines can either be
part of a compiler command line switch or scoped around the include to
@ -3041,7 +3115,7 @@ error.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[23 - FILES]
[24 - FILES]
The source distribution of ExprTk is comprised of the following set of
files:
@ -3071,7 +3145,7 @@ files:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[24 - LANGUAGE STRUCTURE]
[25 - LANGUAGE STRUCTURE]
+-------------------------------------------------------------+
|00 - If Statement |
| |