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\details{
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\details{
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  A user-specified uniform RNG is called from entry points in
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  A user-specified uniform RNG is called from entry points in
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  dynamically-loaded compiled code.  The user must supply the entry point
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  dynamically-loaded compiled code.  The user must supply the entry point
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  \code{user_unif_rand}, which takes no arguments and returns a
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  \code{user_unif_rand}, which takes no arguments and returns a
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  \emph{pointer to} a double. The example below will show the general
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  \emph{pointer to} a double. The example below will show the general
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  pattern.
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  pattern. The generator should have at least 25 bits of precision.
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  Optionally, the user can supply the entry point \code{user_unif_init},
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  Optionally, the user can supply the entry point \code{user_unif_init},
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  which is called with an \code{unsigned int} argument when
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  which is called with an \code{unsigned int} argument when
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  \code{\link{RNGkind}} (or \code{set.seed}) is called, and is intended
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  \code{\link{RNGkind}} (or \code{set.seed}) is called, and is intended
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  to be used to initialize the user's RNG code.  The argument is intended
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  to be used to initialize the user's RNG code.  The argument is intended