eclipse-aascw / aas-core-codegen / 35326854400
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coverage: 85.814%. Remained the same
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Write `xs:double` without loss in the C++ XML (#722)

`SerializeDouble` wrote the value through a stream left at its default
precision, which is six *significant* digits, so 1.2345678901234567 went
out as 1.23457 and could never be read back. Of thirteen representative
values, five did not survive the round trip -- among them one third,
pi to fifteen digits, and both the smallest and the largest double.

As many digits are written now as it takes for the text to read back as
the very same double, and no more. `std::to_chars` would answer that in
one call, but it is C++17 and the library compiles as C++11 -- only the
tests ask for C++17 -- so the three candidates which can matter, 15, 16
and 17 significant digits, are tried in turn and the first which
round-trips is kept. The stream strips the trailing zeros of each, so
a short value stays short: 0.1 is still written as 0.1.

Mind that the round trip is checked on the failbit as well as on
the value. On overflow the stream stores the largest representable
double *and* fails, so comparing the value alone would have accepted
the 15-digit form of the largest double, 1.79769313486232e+308, which
lies above the overflow threshold and which every correctly rounding
parser -- Python's among them -- reads as an infinity. `std::strtod`
reports that overflow properly through `ERANGE`, but it honours
`LC_NUMERIC` for the decimal separator, which is precisely what we avoid
here.

Both streams are given the classic locale. A global locale with
a decimal comma would otherwise have written 1,2345, which is not
a number to any XML parser -- and this went unnoticed only because
the six digits were too few to show a separator in the recorded tests.

34764 of 40511 relevant lines covered (85.81%)

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Jobs
ID Job ID Ran Files Coverage
1 3.10 - 35326854400.1 264
85.81
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2 3.12 - 35326854400.2 264
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3 3.11 - 35326854400.3 264
85.81
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Source Files on build 35326854400