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

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Arash Partow
2017-04-06 08:26:48 +10:00
parent b579791618
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@ -1316,7 +1316,7 @@ side-effects, however the latter, statement 5, is the final statement
in the expression and hence will be assumed to have a side-effect.
During compilation when the DCE optimisation is applied to the above
expression, statement 2 will be removed from the expression, as it has
expression, statement 3 will be removed from the expression, as it has
no bearing on the final result of expression, the rest of the
statements will all remain. The optimised form of the expression is as
follows:
@ -1325,7 +1325,7 @@ follows:
var y := x + 2; // Statement 2
y := x + 3y; // Statement 3
x - y; // Statement 4
8
(3) Conditional Statements (If-Then-Else)
ExprTk support two forms of conditional branching or otherwise known
@ -1358,7 +1358,7 @@ most imperative languages. There are two variations of the statement:
(a) If-Statement
This version of the conditional statement returns the value of the
consequent expression when the condition expression is true, else it
will require a quiet NaN value as its result.
will return a quiet NaN value as its result.
Example 1:
x := if (y < z) y + 3;
@ -2877,8 +2877,8 @@ simple user defined USR:
In the example above, a user specified USR is defined, and is
registered with the parser enabling the USR functionality. The when an
unknown symbol is encountered during the compilation process, the
registered with the parser enabling the USR functionality. Then when
an unknown symbol is encountered during the compilation process, the
USR's process method will be invoked. The USR in the example will only
'accept' unknown symbols that have a prefix of 'var_' as being valid
variables, all other unknown symbols will result in a compilation
@ -4338,14 +4338,16 @@ disable certain features and capabilities. The defines can either be
part of a compiler command line switch or scoped around the include to
the ExprTk header. The defines are as follows:
(1) exprtk_enable_debugging
(2) exprtk_disable_comments
(3) exprtk_disable_break_continue
(4) exprtk_disable_sc_andor
(5) exprtk_disable_enhanced_features
(6) exprtk_disable_string_capabilities
(7) exprtk_disable_superscalar_unroll
(8) exprtk_disable_rtl_io_file
(01) exprtk_enable_debugging
(02) exprtk_disable_comments
(03) exprtk_disable_break_continue
(04) exprtk_disable_sc_andor
(05) exprtk_disable_return_statement
(06) exprtk_disable_enhanced_features
(07) exprtk_disable_string_capabilities
(08) exprtk_disable_superscalar_unroll
(09) exprtk_disable_rtl_io_file
(10) exprtk_disable_rtl_vecops
(1) exprtk_enable_debugging
@ -4366,19 +4368,22 @@ in a compilation failure.
This define will disable the short-circuit '&' (and) and '|' (or)
operators
(5) exprtk_disable_enhanced_features
(5) exprtk_disable_return_statement
This define will disable use of return statements within expressions.
(6) exprtk_disable_enhanced_features
This define will disable all enhanced features such as strength
reduction and special function optimisations and expression specific
type instantiations. This feature will reduce compilation times and
binary sizes but will also result in massive performance degradation
of expression evaluations.
(6) exprtk_disable_string_capabilities
(7) exprtk_disable_string_capabilities
This define will disable all string processing capabilities. Any
expression that contains a string or string related syntax will result
in a compilation failure.
(7) exprtk_disable_superscalar_unroll
(8) exprtk_disable_superscalar_unroll
This define will set the loop unroll batch size to 4 operations per
loop instead of the default 8 operations. This define is used in
operations that involve vectors and aggregations over vectors. When
@ -4386,12 +4391,12 @@ targeting non-superscalar architectures, it may be recommended to
build using this particular option if efficiency of evaluations is of
concern.
(8) exprtk_disable_rtl_io_file
(9) exprtk_disable_rtl_io_file
This define will disable the file I/O RTL package features. When
present, any attempts to register the file I/O package with a given
symbol table will fail causing a compilation error.
(9) exprtk_disable_rtl_vecops
(10) exprtk_disable_rtl_vecops
This define will disable the extended vector operations RTL package
features. When present, any attempts to register the vector operations
package with a given symbol table will fail causing a compilation