Re: Bug in real_parser

On 18-09-16 23:07, peterkochlarsen wrote:
> On Coliru I get the same result.
I'm really unsure why you choose not to link that coliru, or say what
platform/compiler it fails on.

> Lastly, I expected both my examples to parse (leaving "E" or "W" for the
> next part of my grammar), but I did not expect "045.000" to become 45000.

If you want to specify a parser that /does not/ expect an exponent part,
then you **must** specify so. Use a custom real_parser policy.

template <typename T> struct simple_real_policies :
boost::spirit::qi::real_policies<T>
{
    static bool parse_exp(...) { return false; } //  No exponent
};

See it Live On Coliru <http://coliru.stacked-crooked.com/a/d1d48ee326ed485b>

New output:

    '4' -> 4
    '04' -> 4
    '045.' -> 45
    '.0' -> 0
    '7E0' -> -1 (ERR)
    '7.E0' -> -1 (ERR)
    '-4' -> -4
    '-04' -> -4
    '-045.' -> -45
    '-.0' -> -0
    '-7E0' -> -1 (ERR)
    '-7.E0' -> -1 (ERR)
    '+4' -> 4
    '+04' -> 4
    '+045.' -> 45
    '+.0' -> 0
    '+7E0' -> -1 (ERR)
    '+7.E0' -> -1 (ERR)
    '-4' -> -4
    '-04' -> -4
    '-045.' -> -45
    '-.0' -> -0
    '-7E0' -> -1 (ERR)
    '-7.E0' -> -1 (ERR)
    '.4e7' -> -1 (ERR)
    '.4e-7' -> -1 (ERR)
    '045.000W' -> -1 (ERR)
    '045.000E' -> -1 (ERR)

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