Cost_estimate Class Reference

#include <handler.h>

List of all members.

Public Member Functions
double	total_cost () const
	Returns sum of time-consuming costs, i.e., not counting memory cost.
double	get_io_cost () const
double	get_cpu_cost () const
double	get_import_cost () const
double	get_mem_cost () const
bool	is_zero () const
void	reset ()
	Reset all costs to zero.
void	multiply (double m)
	Multiply io, cpu and import costs by parameter.
Cost_estimate &	operator+= (const Cost_estimate &other)
Cost_estimate	operator+ (const Cost_estimate &other)
void	add_io (double add_io_cost)
	Add to IO cost.
void	add_cpu (double add_cpu_cost)
	Add to CPU cost.
void	add_import (double add_import_cost)
	Add to import cost.
void	add_mem (double add_mem_cost)
	Add to memory cost.
Static Public Member Functions
static double	IO_BLOCK_READ_COST ()
	The cost of one I/O operation.

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Detailed Description

Used to store optimizer cost estimates.

The class consists of PODs only: default operator=, copy constructor and destructor are used.

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Member Function Documentation

bool Cost_estimate::is_zero

(

)

const [inline]

Whether or not all costs in the object are zero

Returns:

true if all costs are zero, false otherwise

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The documentation for this class was generated from the following file:

• handler.h