[Issue 8384] Poor wchar/dchar* to string conversion support

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8384


Jonathan M Davis <jmdavisProg at gmx.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jmdavisProg at gmx.com


--- Comment #1 from Jonathan M Davis <jmdavisProg at gmx.com> 2012-07-13 12:00:53 PDT ---
So, you expect %s on a pointer to give you the string that it points to? Why?
It's pointer, not a string. It's going to convert the pointer. That works as
expected.

to!string should take null-terminated string and give you a string, and it does
that. This code passes:

import std.conv;
import std.string;

void main()
{
    static void test(T)(T lp)
    {
        assert(to!string(lp), "hello world");
    }

    test("Hello, world!" .ptr);
    test("Hello, world!"w.ptr);
    test("Hello, world!"d.ptr);
}

So, I'd say that as far as your code goes, there's nothing wrong with it. It
functions exactly as expected. What _doesn't_ work is this:

import std.conv;
import std.string;

void main()
{
    static void test(T)(T lp)
    {
        assert(to!wstring(lp), "hello world");
        assert(to!dstring(lp), "hello world");
    }

    test("Hello, world!" .ptr);
    test("Hello, world!"w.ptr);
    test("Hello, world!"d.ptr);
}

The code doesn't even compile, giving these errors:

/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/conv.d(819): Error:
incompatible types for
((cast(immutable(dchar)[])_adDupT(&_D12TypeInfo_Aya6__initZ,value[cast(ulong)0..strlen(cast(const(char*))value)]))
? (null)): 'immutable(dchar)[]' and 'string'
/home/jmdavis/dmd2/linux/bin/../../src/phobos/std/conv.d(268): Error: template
instance std.conv.toImpl!(immutable(dchar)[],immutable(char)*) error
instantiating
q.d(8):        instantiated from here: to!(immutable(char)*)
q.d(11):        instantiated from here: test!(immutable(char)*)
q.d(8): Error: template instance
std.conv.to!(immutable(dchar)[]).to!(immutable(char)*) error instantiating
q.d(11):        instantiated from here: test!(immutable(char)*)
q.d(11): Error: template instance q.main.test!(immutable(char)*) error
instantiating

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