xfygogo/exprtk
1
0
Fork 0
mirror of https://github.com/ArashPartow/exprtk.git synced 2025-06-12 16:27:23 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source
This commit is contained in:
Arash Partow
2014-12-26 06:31:45 +11:00
parent 371d28c3a8
commit e0bbb336dd
2 changed files with 44 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
readme.txt
View File

@ -1404,11 +1404,12 @@ parameters in the following sequence:
A final piece of type checking functionality is available for the
scenarios where a single function name is intended to be used for
multiple distinct parameter sequences. The parameter sequences are
passed to the constructor as a single string delimited by the pipe '|'
character. Two specific overrides of the function operator are
provided one for standard generic functions and one for string
returning functions. The overrides are as follows:
multiple distinct parameter sequences, another name for this feature
is function overloading. The parameter sequences are passed to the
constructor as a single string delimited by the pipe '|' character.
Two specific overrides of the function operator are provided one for
standard generic functions and one for string returning functions. The
overrides are as follows:
// f(psi,i_0,i_1,....,i_N) --> Scalar
inline T operator()(const std::size_t& ps_index,
@ -1918,7 +1919,13 @@ into account when using Exprtk:
be to recompile an expression from its string form every time
it requires evaluating.
(24) The following are examples of compliant floating point value
(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.
(25) The following are examples of compliant floating point value
representations:
(a) 12345 (e) -123.456
@ -1926,13 +1933,13 @@ into account when using Exprtk:
(c) +012.045e+07 (g) .1234
(d) 123.456f (h) -321.654E+3L
(25) Expressions may contain any of the following comment styles:
(26) Expressions may contain any of the following comment styles:
1. // .... \n
2. # .... \n
3. /* .... */
(26) The 'null' value type is a special non-zero type that
(27) The 'null' value type is a special non-zero type that
incorporates specific semantics when undergoing operations with
the standard numeric type. The following is a list of type and
boolean results associated with the use of 'null':
@ -1947,7 +1954,7 @@ into account when using Exprtk:
8. null != null --> false
9. null != x --> false
(27) The following is a list of reserved words and symbols used by
(28) The following is a list of reserved words and symbols used by
ExprTk. Attempting to add a variable or custom function to a
symbol table using any of the reserved words will result in a
failure.
@ -1963,7 +1970,7 @@ into account when using Exprtk:
sum, swap, switch, tanh, tan, true, trunc, until, var,
while, xnor, xor, xor
(28) Every valid ExprTk statement is a "value returning" expression.
(29) Every valid ExprTk statement is a "value returning" expression.
Unlike some languages that limit the types of expressions that
can be performed in certain situations, in ExprTk any valid
expression can be used in any "value consuming" context. eg:
@ -1971,9 +1978,9 @@ into account when using Exprtk:
var y := 3;
for (var x := switch
{
case 1 : 7;
case 2 : -1 + ~{var x{};};
default: y > 2 ? 3 : 4;
case 1 : 7;
case 2 : -1 + ~{var x{};};
default : y > 2 ? 3 : 4;
};
x != while (y > 0) { y -= 1; };
x -= {if(min(x,y) < 2 * max(x,y))