stillwater-sc / universal / 22510943088

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Commit Message

feat(dfloat): portable blockbinary storage, string I/O, and formatting (#524)

* feat(dfloat): adding comprehension facilities to dfloat

* refactor(dfloat): replace raw block storage and __uint128_t with blockbinary<>

Replaces bt _block[nrBlocks] with blockbinary<nbits> for encoding storage
and replaces the platform-specific __uint128_t significand_t with
blockbinary<4*ndigits+8> for significand arithmetic. This eliminates all
14 __SIZEOF_INT128__ guards, making decimal128 (dfloat<34,12>) fully
portable to MSVC and extensible to arbitrary precision beyond 38 digits.

Unified all dual code paths in operator+=, operator*=, operator/=,
pack/unpack, and DPD encode/decode into single implementations that
work uniformly for any ndigits via blockbinary's arbitrary-width
arithmetic.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(dfloat): add iostream format flag support to str() and operator<<

str() now respects scientific, fixed, and automatic format modes with
precision control. In automatic mode, scientific notation is used when
the decimal exponent exceeds the type's digit count, preventing enormous
strings for extreme values like numeric_limits::max() and min().
operator<< extracts std::scientific/std::fixed/setw flags from the
stream and delegates to str() accordingly.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(dfloat): use native formatting in dynamic_range() instead of double cast

dynamic_range() was casting dfloat values to double before printing,
causing overflow to inf for decimal64/128 maxpos (scale 384/6144 exceeds
double max ~1.8e308) and underflow to 0 for their minpos values. Print
dfloat values directly via operator<< to preserve the full decimal
dynamic range.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(dfloat): enhancing the dfloat api examples

* feat(dfloat): implement decimal string parsing in assign() and default to ndigits precision

Implement assign(const std::string&) to p... (continued)

Run Details

207 of 219 new or added lines in 3 files covered. (94.52%)

4 existing lines in 2 files now uncovered.

38935 of 46235 relevant lines covered (84.21%)

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