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easyxs/README.md  view on Meta::CPAN

## SV “Typing”

Perl scalars are supposed to be “untyped”, at least insofar as
strings/numbers. When conversing with other languages, though, or
serializing it’s usually helpful to break things down in greater
detail.

EasyXS defines an `exs_sv_type` macro that takes an SV as argument
and returns a member of `enum exs_sv_type_e` (typedef’d as just
`exs_sv_type_e`; see `easyxs_scalar.h` for values). The logic is compatible
with the serialization logic formulated during Perl 5.36’s development cycle.

## SV/Number Conversion

### `UV* exs_SvUV(SV* sv)`

Like `SvUV`, but if the SV’s content can’t be a UV
(e.g., the IV is negative, or the string has non-numeric characters)
an exception is thrown.

## SV/String Conversion

quickjs/libbf.c  view on Meta::CPAN

        bf_mul(Q, Q, &Q2, prec, BF_RNDN);
        bf_delete(&Q2);
        if (need_g)
            bf_mul(G, G, &G2, prec, BF_RNDN);
        bf_delete(&G2);
    }
}

/* compute Pi with faithful rounding at precision 'prec' using the
   Chudnovsky formula */
static void bf_const_pi_internal(bf_t *Q, limb_t prec)
{
    bf_context_t *s = Q->ctx;
    int64_t n, prec1;
    bf_t P, G;

    /* number of serie terms */
    n = prec / CHUD_BITS_PER_TERM + 1;
    /* XXX: precision analysis */
    prec1 = prec + 32;