Re: Lua 5.2 - emulation of old setfenv

[HyperHacker <hyperhacker@...>]

On Thu, Jan 6, 2011 at 00:17, Dirk Laurie <dpl@sun.ac.za> wrote:
> On Thu, Jan 06, 2011 at 07:56:58AM +0200, Miles Bader wrote:
>> Lorenzo Donati <lorenzodonatibz@interfree.it> writes:
>> First step: what's the best way to detect one is running in 5.2?
>>
>> I can do:
>>
>>    local lua_52 = string.match(_VERSION, " 5[.]2$")
>>
>> but my impression is that such version-string matching is often thought
>> of as being not-so-good (e.g., the above will fail in 5.3 or 6.0, even
>> though they're likely to be more like 5.2 than 5.1).
>
> local lua_version = tonumber(string.match(_VERSION,'%d*%.%d*'))
>
> will allow the test
>
>    if lua_version >= tonumber('5.2') then -- etc
>
> Dirk
>
>
>

I had been wondering why aside from _VERSION there isn't some variable
with the numeric version number for this purpose.

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