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PERL Functions
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PERL vec Function
Syntax
Definition and Usage
Uses the string specified EXPR as a vector of unsigned integers. The NUMBITS parameter is the number of bits that are reserved for each entry in the bit vector. This must be a power of two from 1 to 32. Note that the offset is the marker for the end of the vector, and it counts back the number of bits specified to find the start. Vectors can be manipulated with the logical bitwise operators |, & and ^.
Return Value
Example
#!/usr/bin/perl -w
$vec = '';
vec($vec, 3, 4) = 1; # bits 0 to 3
vec($vec, 7, 4) = 10; # bits 4 to 7
vec($vec, 11, 4) = 3; # bits 8 to 11
vec($vec, 15, 4) = 15; # bits 12 to 15
# As there are 4 bits per number this can
# be decoded by unpack() as a hex number
print("vec() Has a created a string of nybbles,
in hex: ", unpack("h*", $vec), "\n");
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It will produce following results:
vec() Has a created a string of nybbles,
in hex: 0001000a0003000f
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