ibis::math Namespace Reference

A namespace for arithmetic expressions. More...

Classes
class	barrel
	A barrel to hold a list of variables. More...
class	bediener
	An operator. Bediener is German for operator. More...
class	customFunction1
	One-argument custom functions. More...
class	formatUnixTime
	Format unix time stamps as strings through the function strftime and then output the leading portion as a floating-point number. More...
class	fromUnixTime
	Functor for converting a unix time stamp into date-time format throught strftime. More...
class	func1
	Pure virtual base function for 1-argument functions. More...
class	literal
	A string literal. More...
class	number
	A number. More...
class	sfunc1
	Pure virtual base function for 1-argument functions. More...
class	stdFunction1
	One-argument standard functions. More...
class	stdFunction2
	Two-argument standard functions. More...
class	stringFunction1
	One-argument string functions. More...
class	term
	The abstract base class for arithmetic terms. More...
class	toUnixTime
	Functor to convert ISO 8601 style date time value to a unix time stamp. More...
class	variable
	A variable. More...

Enumerations
enum	OPERADOR {   UNKNOWN =0, BITOR, BITAND, PLUS,   MINUS, MULTIPLY, DIVIDE, REMAINDER,   NEGATE, POWER }
	All supported arithmetic operators. More...
enum	STDFUN1 {   ACOS =0, ASIN, ATAN, CEIL,   COS, COSH, EXP, FABS,   FLOOR, FREXP, LOG10, LOG,   MODF, ROUND, SIN, SINH,   SQRT, TAN, TANH, TRUNC,   IS_ZERO, IS_NONZERO }
	Standard 1-argument functions.
enum	STDFUN2 {   ATAN2 =0, FMOD, LDEXP, ROUND2,   POW, IS_EQL, IS_GTE, IS_LTE }
	Standard 2-argument functions.
enum	TERM_TYPE {   UNDEF_TERM, VARIABLE, NUMBER, STRING,   OPERATOR, STDFUNCTION1, STDFUNCTION2, CUSTOMFUNCTION1,   CUSTOMFUNCTION2, STRINGFUNCTION1, STRINGFUNCTION2 }
	Types of terms allowed in the mathematical expressions.

Variables
const char *	operator_name []
	String form of the operators. More...
bool	preserveInputExpressions = false
	Whether to keep arithmetic expression as user inputed them. More...
const char *	stdfun1_name []
	String form of the one-argument standard functions. More...
const char *	stdfun2_name []
	String form of the two-argument standard functions. More...

Detailed Description

A namespace for arithmetic expressions.

Enumeration Type Documentation

enum ibis::math::OPERADOR

All supported arithmetic operators.

The word operador is Spainish for operator.

Variable Documentation

const char * ibis::math::operator_name

Initial value:

=
    {"?", "|", "&", "+", "-", "*", "/", "%", "-", "**"}

String form of the operators.

Referenced by ibis::math::bediener::print().

bool ibis::math::preserveInputExpressions = false

Whether to keep arithmetic expression as user inputed them.

• If it is true, FastBit will not consolidate constant expressions nor perform other simple optimizations.
• If it is false, the software will attempt to minimize the number of operations needed to apply them on data records.

Note

Keep the arithmetic expressions unaltered will preserve its round-off properties and produce exactly the same numeric results as one might expect. However, this is normally not the most important consideration as the differences are typically quite small. Therefore, the default value of this variable is false.

Referenced by ibis::qExpr::simplify(), ibis::selectClause::verify(), and ibis::selectClause::verifySome().

const char * ibis::math::stdfun1_name

Initial value:

=
    {"acos", "asin", "atan", "ceil", "cos", "cosh", "exp", "fabs", "floor",
     "frexp", "log10", "log", "modf", "round", "sin", "sinh", "sqrt", "tan",
     "tanh", "is_zero", "is_nonzero"}

String form of the one-argument standard functions.

Referenced by ibis::math::stdFunction1::print().

const char * ibis::math::stdfun2_name

Initial value:

= 
    {"atan2", "fmod", "ldexp", "round", "pow",
     "is_eql", "is_gte", "is_lte"}

String form of the two-argument standard functions.

Referenced by ibis::math::stdFunction2::print().