Representation length of integral types

[rumbu via Digitalmars-d]

On Tuesday, 4 August 2015 at 04:10:33 UTC, tcak wrote:
> There is a use case for me that I am given a string, and before 
> even trying to convert it to integer, I want to check whether 
> it is valid. One of the checks necessary for this is the length 
> of string.
>
> So, if I have received "156" and it should be converted to 
> ubyte, I would check whether it is at most 3 bytes length.
>
> While doing that someone would define that maximum length in 
> the code, while length information is constant and never 
> changes.
>
> For this reason, however data types have properties like max, 
> min, and init, I would ask for addition of new properties for 
> integral (even for floating points as well) types as (Example 
> values for ubyte):
>
> max_hex_length = 2
> max_dec_length = 3
> max_bin_length = 8

enum max_hex_length = T.sizeof * 2;
enum max_bin_length = T.sizeof * 8;
enum max_dec_length = cast(T)log10(T.sizeof) + 1;