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Fixes #6571 (documentation update, added 'why lexical_cast does not understand "-1.#IND"' question and answer to it)

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[SVN r77118]
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Antony Polukhin
2012-02-26 09:19:55 +00:00
parent 0dded6d3a7
commit 83639bd9ae
1 changed files with 8 additions and 0 deletions
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doc/lexical_cast.qbk
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@@ -167,6 +167,14 @@ if a negative number is read, no errors will arise and the result will be the tw
`boost::lexical_cast` sees single `wchar_t` character as `unsigned short`. It is not a `boost::lexical_cast` mistake, but a
limitation of compiler options that you use.
[pre
]
* [*Question:] Why `boost::lexical_cast<double>("-1.#IND");` throws `boost::bad_lexical_cast`?
* [*Answer:] `"-1.#IND"` is a compiler extension, that violates standard. You shall input `"-nan"`, `"nan"`, `"inf"`
, `"-inf"` (case insensitive) strings to get NaN and Inf values. `boost::lexical_cast<string>` outputs `"-nan"`, `"nan"`,
`"inf"`, `"-inf"` strings, when has NaN or Inf input values.
[endsect]
[section Changes]