Advanced Service Routine Data Types

The Advanced Service routines refer to a structure defining the properties of the basic generator.

This structure is described as follows:

typedef struct _VSLBRngProperties {
       int StreamStateSize;
       int NSeeds;
       int IncludesZero;
       int WordSize;
       int NBits;
       InitStreamPtr InitStream;
       sBRngPtr sBRng;
       dBRngPtr dBRng;
       iBRngPtr iBRng; 
} VSLBRngProperties;

The following table provides brief descriptions of the fields engaged in the above structure:

Field Descriptions
Field	Short Description
StreamStateSize	The size, in bytes, of the stream state structure for a given basic generator.
NSeeds	The number of 32-bit initial conditions (seeds) necessary to initialize the stream state structure for a given basic generator.
IncludesZero	Flag value indicating whether the generator can produce a random 0.
WordSize	Machine word size, in bytes, used in integer-value computations. Possible values: 4, 8, and 16 for 32, 64, and 128-bit generators, respectively.
NBits	The number of bits required to represent a random value in integer arithmetic. Note that, for instance, 48-bit random values are stored to 64-bit (8 byte) memory locations. In this case, wordsize/WordSize is equal to `8` (number of bytes used to store the random value), while nbits/NBits contains the actual number of bits occupied by the value (in this example, `48`).
InitStream	Contains the pointer to the initialization routine of a given basic generator.
sBRng	Contains the pointer to the basic generator of single precision real numbers uniformly distributed over the interval (`a,b`) (float).
dBRng	Contains the pointer to the basic generator of double precision real numbers uniformly distributed over the interval (`a,b`) (double).
iBRng	Contains the pointer to the basic generator of integer numbers with uniform bit distribution (unsigned int).