On Thursday, 4 March 2021 at 13:58:48 UTC, frankp wrote:
Hi all,
I want to make an opaque type that simply contains an integer
with some immutable constants and toString pretty printing.
Like this:
struct Foo_t
{
private long foo;
alias foo this;
static immutable long Inf = long.max; //1)
void toString(...){}
}
On dmd 2.092.1 this fails with:
1) Error: cannot implicitly convert expression 9223...L of
type immutable(long) to Foo_t
I simply want to initialize an immutable long with long.max.
Why the conversion to Foo_t ?
If I add a constructor:
private this(long f)
{
foo = f;
}
It compiles but according to code coverage this constructor is
never called.
What's going on?
This is the text of my program
import std.stdio;
struct Foo_t
{
private long foo;
alias foo this;
static immutable long Inf = long.max; //1)
void toString(...){ writeln(foo); }
}
void main()
{
Foo_t sample;
sample.foo = 100;
sample.toString();
}
This is the results of running the program:
PS C:\Users\someone\source\tests> dmd forum1.d
PS C:\Users\someone\source\tests> ./forum1.exe
100
PS C:\Users\someone\source\tests> dmd --version
DMD32 D Compiler v2.095.1-dirty
Copyright (C) 1999-2020 by The D Language Foundation, All Rights
Reserved written by Walter Bright
So I was not able to reproduce your issue. Is it possible that
error is coming from somewhere else?
