stillwater-sc / universal / 25994639561

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Commit Message

feat: operator>> hygiene + ereal nan/inf for decimal/elastic family (Phase E of #835) (#858)

* feat: operator>> hygiene + ereal nan/inf token routing for decimal/elastic family (Phase E of #835)

Phase E wraps up the decimal/elastic family with minimal API parity work.
Six types covered (dfloat, einteger, edecimal, erational, efloat, ereal);
full-implementation work for each is captured in dedicated tracking
issues #852-#857 since the gaps vary significantly per type.

What ships in this PR (per type):

dfloat:
  - operator>> extraction guard + setstate(failbit). Existing assign()
    already implements full nan/inf-aware decimal parsing; no parse()
    body changes here.

einteger:
  - operator>> extraction guard + setstate(failbit).
  - Fixed pre-existing copy-paste typo "into a posit value" ->
    "into an einteger value".

edecimal:
  - operator>> extraction guard + setstate(failbit).

erational:
  - operator>> extraction guard + setstate(failbit).

efloat:
  - operator>> extraction guard + setstate(failbit). parse() body
    remains a stub; full implementation tracked in #856.

ereal:
  - operator>> extraction guard + setstate(failbit).
  - Added nan / inf / infinity token detection (case-insensitive,
    optional sign) before the digit-accumulation loop, routing to
    setnan / setinf(sign). The digit loop would otherwise reject any
    alphabetic character outright.

Tests (6 new files, ReportTestSuite pattern):
  - static/float/dfloat/conversion/string_parse.cpp
  - elastic/einteger/conversion/string_parse.cpp
  - elastic/decimal/conversion/string_parse.cpp
  - elastic/rational/decimal/conversion/string_parse.cpp
  - elastic/efloat/conversion/string_parse.cpp
  - elastic/ereal/conversion/string_parse.cpp

Each covers: canonical parse where supported, nan/inf token routing
where supported, operator>> failbit on a bad token. Tests intentionally
stay narrow -- broader coverage will land with the per-type full
implementations in #852-#857.

Verif... (continued)

Coverage Stats

75 of 80 new or added lines in 6 files covered. (93.75%)

32 existing lines in 3 files now uncovered.

46609 of 55453 relevant lines covered (84.05%)

6432960.87 hits per line