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All features
class PRESS_RANDOM_NUMBER_GENERATOR
Summary
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Press' standard generator, which uses the MINIMAL_RANDOM_NUMBER_GENERATOR and then uses shuffling to break up short order correlations.
Direct parents
Inherit list: MINIMAL_RANDOM_NUMBER_GENERATOR
Insert list: MINIMAL_RANDOM_NUMBER_GENERATOR
Class invariant
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Overview
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Creation features
{ANY}
  • with_seed (seed_value: INTEGER_32)
    Create (or reset) the random number generator with an explicit seed_value.
{ANY}
  • make
    Create (or reset) the random number generator with an automatic randomised setting of the seed_value based on the CPU clock.
Features
{}
{ANY}
{}
{ANY}
  • make
    Create (or reset) the random number generator with an automatic randomised setting of the seed_value based on the CPU clock.
{}
writable attribute
{}
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ntab: INTEGER_32
is 32
constant attribute
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writable attribute
{}
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with_seed (seed_value: INTEGER_32)
effective procedure
{ANY}
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Create (or reset) the random number generator with an explicit seed_value.
next
effective procedure
{ANY}
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Prepare the next random number in sequence.
last_integer (n: INTEGER_32): INTEGER_32
effective function
{ANY}
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The last computed number in range 1 to n(see ensure).
last_real: REAL_64
effective function
{ANY}
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The last computed number in range 0.0 to 1.0 excluded (see ensure).
is 2147483647
constant attribute
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is 16807
constant attribute
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is 127773
constant attribute
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is 2836
constant attribute
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seed: INTEGER_32
writable attribute
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make
effective procedure
{ANY}
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Create (or reset) the random number generator with an automatic randomised setting of the seed_value based on the CPU clock.
clock_based_random_seed: INTEGER_32
effective function
{}
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Some positive random value to be used as a seed which may change as much as possible in a random way.