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

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Arash Partow
2015-03-29 23:43:29 +11:00
parent 53b2977902
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readme.txt
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@ -948,10 +948,10 @@ correctly optimize such expressions for a given architecture.
[13 - VARIABLE & VECTOR DEFINITION]
ExprTk supports the definition of expression local variables and
vectors. The definitions must be unique as shadowing is not allowed
and object life-times are based on scope. Definitions use the
[13 - VARIABLE , VECTOR & STRING DEFINITION]
ExprTk supports the definition of expression local variables, vectors
and strings. The definitions must be unique as shadowing is not
allowed and object life-times are based on scope. Definitions use the
following general form:
var <name> := <initialiser>;
@ -998,14 +998,45 @@ zero. The following are examples of vector definitions:
var x[0];
(3) Return Value
(3) String Definition
Strings are a sequence of 8-bit characters. They can only be defined
with an explicit initialisation value. The following are examples of
string variable definitions:
(a) Initialise to a string
var x := 'abc';
(b) Initialise to a string expression
var x := 'abc' + '123';
(c) Initialise to a string range
var x := 'abc123'[2:4];
(d) Initialise to another string variable
var x := 'abc';
var y := x;
(e) Initialise to another string variable range
var x := 'abc123';
var y := x[2:4];
(f) Initialise to a string expression
var x := 'abc';
var y := x + '123';
(f) Initialise to a string expression range
var x := 'abc';
var y := (x + '123')[1:3];
(4) Return Value
Variable and vector definitions have a return value. In the case of
variable definitions, the value to which the variable is initialised
will be returned. Where as for vectors, the value of the first element
(eg: v[0]) will be returned.
(4) Variable/Vector Assignment
(5) Variable/Vector Assignment
The value of a variable can be assigned to a vector and a vector or a
vector expression can be assigned to a variable.