On Monday, 11 October 2021 at 00:19:44 UTC, apz28 wrote:
/* Getting this error
onlineapp.d(34): Error: none of the overloads of `toString` are
callable using argument types `(Buffer)`, candidates are:
onlineapp.d(19): `onlineapp.Foo.toString()`
onlineapp.d(26): `onlineapp.Foo.toString(const(char)[]
fmt)`
onlineapp.d(22): `toString(Writer, Char)(return ref
Writer sink)`
*/
The signature of your `toString` method should match one of the
examples in [the documentation][1]:
```d
void toString(Writer, Char)(ref Writer w, const ref
FormatSpec!Char fmt)
void toString(Writer)(ref Writer w)
string toString();
```
Here is an example that works:
```d
import std.range: put;
import std.array: appender;
import std.format: formattedWrite;
struct Foo
{
void toString(Writer)(ref Writer writer)
{
put(writer, "Foo");
}
}
void main()
{
auto buffer = appender!string;
Foo foo;
formattedWrite(buffer, "%s", foo);
assert(buffer[] == "Foo");
}
```
Link: https://run.dlang.io/is/dZLRuo
[1]: https://phobos.dpldocs.info/std.format.write.html
