digitalmars.D.learn - SList of chars not possible?
- They call me Mr. D (17/17) Nov 01 2012 auto i = SList!int(1, 2, 3, 4, 5, 6, 7);
- =?UTF-8?B?QWxpIMOHZWhyZWxp?= (7/23) Nov 01 2012 Looks related to the fact that the element type of a char[] range is
- Simen Kjaeraas (6/23) Nov 02 2012 Not sure of the exact reasons, but I think Ali is probably right.
- Tobias Pankrath (8/13) Nov 02 2012 The error is: the constructor of SList!T takes a U[] if U is
auto i = SList!int(1, 2, 3, 4, 5, 6, 7);
auto f = SList!float(1.1, 2.234, 3.21, 4.3, 5.001, 6.2, 7.0);
auto s = SList!string(["I", "Hello", "World"]);
auto c = SList!char('a', 'b' ,'c'); // doesn't compile, get the
following
C:\D\dmd2\windows\bin\..\..\src\phobos\std\container.d(905):
Error: template std.container.SList!(char).SList.insertFront does
not match any function template
eclaration
C:\D\dmd2\windows\bin\..\..\src\phobos\std\container.d(1096):
Error: template std.container.SList!(char).SList.insertFront
cannot deduce template function from
argument types !()(char[])
Container.d(19): Error: template instance
std.container.SList!(char).SList.__ctor!(char) error instantiating
auto c = SList!char(['a', 'b' ,'c']); // doesn't compile either.
Seems to me a Slist of char nodes should be pretty innocuous.
Nov 01 2012
=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com>
On 11/01/2012 03:18 PM, They call me Mr. D wrote:
auto i = SList!int(1, 2, 3, 4, 5, 6, 7);
auto f = SList!float(1.1, 2.234, 3.21, 4.3, 5.001, 6.2, 7.0);
auto s = SList!string(["I", "Hello", "World"]);
auto c = SList!char('a', 'b' ,'c'); // doesn't compile, get the following
C:\D\dmd2\windows\bin\..\..\src\phobos\std\container.d(905): Error:
template std.container.SList!(char).SList.insertFront does not match any
function template
eclaration
C:\D\dmd2\windows\bin\..\..\src\phobos\std\container.d(1096): Error:
template std.container.SList!(char).SList.insertFront cannot deduce
template function from
argument types !()(char[])
Container.d(19): Error: template instance
std.container.SList!(char).SList.__ctor!(char) error instantiating
auto c = SList!char(['a', 'b' ,'c']); // doesn't compile either.
Seems to me a Slist of char nodes should be pretty innocuous.
Looks related to the fact that the element type of a char[] range is
dchar, not char. So, SList!dchar works:
auto c = SList!dchar('a', 'b' ,'c');
SList!ubyte may make sense too but it requires a cast:
auto u = SList!ubyte(cast(ubyte[])[ 'a', 'b' ,'c' ]);
Ali
Nov 01 2012
On 2012-18-01 23:11, They call me Mr. D <kheaser eapl.org> wrote:
auto i = SList!int(1, 2, 3, 4, 5, 6, 7);
auto f = SList!float(1.1, 2.234, 3.21, 4.3, 5.001, 6.2, 7.0);
auto s = SList!string(["I", "Hello", "World"]);
auto c = SList!char('a', 'b' ,'c'); // doesn't compile, get the
following
C:\D\dmd2\windows\bin\..\..\src\phobos\std\container.d(905): Error:
template std.container.SList!(char).SList.insertFront does not match any
function template
eclaration
C:\D\dmd2\windows\bin\..\..\src\phobos\std\container.d(1096): Error:
template std.container.SList!(char).SList.insertFront cannot deduce
template function from
argument types !()(char[])
Container.d(19): Error: template instance
std.container.SList!(char).SList.__ctor!(char) error instantiating
auto c = SList!char(['a', 'b' ,'c']); // doesn't compile either.
Seems to me a Slist of char nodes should be pretty innocuous.
Not sure of the exact reasons, but I think Ali is probably right.
A char cannot hold all possible values for a unicode character, so
having a range with that element type is not really a good idea.
--
Simen
Nov 02 2012
The error is: the constructor of SList!T takes a U[] if U is implicitly convertible to T, but forwards to insertFront which requires a range of T. But inside phobos char[] is a range of dchar, so if fails. Imo a clear bug.Not sure of the exact reasons, but I think Ali is probably right. A char cannot hold all possible values for a unicode character, so having a range with that element type is not really a good idea.Still, if you want to have a container of char for whatever reasons it shouldn't fail so miserably. The special treatment of char[] as range of dchar everywhere in phobos just produces bugs and confusion.
Nov 02 2012