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

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Arash Partow
2014-12-29 05:43:32 +11:00
parent e0bbb336dd
commit c8657e95a2
3 changed files with 475 additions and 198 deletions
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22
readme.txt
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@ -403,13 +403,19 @@ of C++ compilers:
| | will be performed. (eg: 1.67 --> 1) |
+----------+---------------------------------------------------------+
| := | Assign the value of x to y. Where x is a mutable string |
| | and y is either a string or a string range. eg: |
| | or string range and y is either a string or a string |
| | range. eg: |
| | 1. x := y |
| | 2. x := 'abc' |
| | 3. x := y[:i + j] |
| | 4. x := '0123456789'[2:7] |
| | 5. x := '0123456789'[2i + 1:7] |
| | 6. x := (y := '0123456789'[2:7]) |
| | 7. x[i:j] := y |
| | 8. x[i:j] := (y + 'abcdefg'[8 / 4:5])[m:n] |
| | |
| | Note: For options 7 and 8 the shorter of the two ranges |
| | will denote the number characters that are to be copied.|
+----------+---------------------------------------------------------+
| + | Concatenation of x and y. Where x and y are strings or |
| | string ranges. eg |
@ -841,6 +847,7 @@ following are examples of the various transformations that can occur:
(d) (2 / x) / (3 / y) ---> (2 / 3) / (x * y)
(e) (2 * x) * (3 * y) ---> (2 * 3) * (x * y)
Note:
When using strength reduction in conjunction with expressions whose
inputs or sub-expressions may result in values nearing either of the
@ -1919,11 +1926,14 @@ into account when using Exprtk:
be to recompile an expression from its string form every time
it requires evaluating.
(24) Where appropriate the return values of method invocations from
the parser and symbol_table should be taken into account.
Specifically the 'compile' method of the parser and the
'add_xxx' set of methods of the symbol table as they denote
success or failure of the invoked call.
(24) It is strongly recommended that the return value of method
invocations from the parser and symbol_table types be taken
into account. Specifically the 'compile' method of the parser
and the 'add_xxx' set of methods of the symbol_table as they
denote either the success or failure state of the invoked call.
Cointinued processing from a failed state without having first
rectified the underlying issue will in turn result in further
failures and undefined behaviours.
(25) The following are examples of compliant floating point value
representations: