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May 28, 2017 How to call readf | ||||
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Hi, I am learning how to use readf to read integers. I follow the example in https://dlang.org/library/std/stdio/readf.html The sample code use readf in following way readf!" %d"(a); It works when I use dmd 2.074. However, I got compile error when I switch to ldc2 /usr/include/d/std/stdio.d(3339): Error: tuple A is used as a type b.d(8): Error: template instance std.stdio.readf!" %d" error instantiating It turns out that I can compile the code using ldc2 if I change the line to readf(" %d", &a); So my questions are 1. Should I use ampersand? I search the web and other people use ampersand. But from the doc I guess that I can also pass arguments as ref and do need to use ampersand? 2. I also tried changing the code to readf!" %d"(&a); and ldc2 gives me the same error. I search and the ! does something called template instantiation. Why it does not work here? Thanks for your help! |
May 28, 2017 Re: How to call readf | ||||
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Posted in reply to Petras | On 05/28/2017 07:55 AM, Petras wrote: > Hi, I am learning how to use readf to read integers. I follow the > example in https://dlang.org/library/std/stdio/readf.html > > The sample code use readf in following way > readf!" %d"(a); Providing the format string as a template argument and being able to pass references are both 2.074 features. > It turns out that I can compile the code using ldc2 if I change the line to > readf(" %d", &a); That's the old way that should work with 2.074 as well. Ali |
May 28, 2017 Re: How to call readf | ||||
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Posted in reply to Ali Çehreli | On Sunday, 28 May 2017 at 15:00:30 UTC, Ali Çehreli wrote:
> On 05/28/2017 07:55 AM, Petras wrote:
> > Hi, I am learning how to use readf to read integers. I follow
> the
> > example in https://dlang.org/library/std/stdio/readf.html
> >
> > The sample code use readf in following way
> > readf!" %d"(a);
>
> Providing the format string as a template argument and being able to pass references are both 2.074 features.
>
> > It turns out that I can compile the code using ldc2 if I
> change the line to
> > readf(" %d", &a);
>
> That's the old way that should work with 2.074 as well.
>
> Ali
Thanks!
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