[Issue 8164] New: BigInt from char[] too

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8164

           Summary: BigInt from char[] too
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: bearophile_hugs at eml.cc


--- Comment #0 from bearophile_hugs at eml.cc 2012-05-30 04:57:00 PDT ---
I have code that generates arrays of mutable chars, and I have to convert them
to BigInts. I'd like this to be allowed:

import std.bigint: BigInt;
void main() {
    char[] s1 = "123".dup;
    assert(BigInt(s1) == 123);
    char[] s2 = "0xABC".dup;
    assert(BigInt(s2) == 2748);
}


DMD 2.060alpha gives:

...\dmd2\src\phobos\std\bigint.d(97): Error: function
std.internal.math.biguintcore.BigUint.fromHexString (string s) is not callable
using argument types (char[])
...\dmd2\src\phobos\std\bigint.d(97): Error: cannot implicitly convert
expression (s[2u..__dollar]) of type char[] to string
...\dmd2\src\phobos\std\bigint.d(99): Error: function
std.internal.math.biguintcore.BigUint.fromDecimalString (string s) is not
callable using argument types (char[])
...\dmd2\src\phobos\std\bigint.d(99): Error: cannot implicitly convert
expression (s) of type char[] to string
test.d(4): Error: template instance std.bigint.BigInt.__ctor!(char[]) error
instantiating


Current workaround: I use a cast:

char[] s1 = "123".dup;
assert(BigInt(cast(string)s1) == 123);

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