Manually construct ArgList and pass to fmt::print

[Mark-Joy]

Hello,

Is there a way to manually construct the ArgList, add new arg to ArgList and then pass it to fmt::print.
Something like:

fmt::ArgList argl(int val1, string str2, double db3);
argl.add(string str4);

fmt::print(string str, argl)

Thank you

[vitaut]

Yes, although this method relies on internal APIs at the moment: #330 (comment)

[Mark-Joy]

Hello,

I just updated latest version of fmtlib to my project and the old code won't compile. How to achieve the same thing as #330 (comment) with latest version?
Can you also make this officially supported without using internal api?

enum {NUM_ARGS = 2};
  typedef fmt::internal::ArgArray<2> ArgArray;
  typename ArgArray::Type array;
  array[0] = ArgArray::template make<fmt::BasicFormatter<char> >(42);
  array[1] = ArgArray::template make<fmt::BasicFormatter<char> >(43);
  fmt::ArgList args(fmt::internal::make_type(42, 43), array);
  fmt::printf("%d %d", args);

[vitaut]

@Mark-Joy, it is much simpler in the latest version and you don't need to use internal APIs any more:

  fmt::vprintf("%d %d", fmt::make_printf_args(42, 43));

Compiler Explorer: https://godbolt.org/g/74wSR7

[Mark-Joy]

@vitaut, Thank you for your answer.
I suppose I would use make_format_args for:

fmt::vprint("{} {}", fmt::make_format_args(42, 43));

How about constructing arglist using a for loop as in this comment ?

[vitaut]

@Mark-Joy there is no API for constructing arglist in a for loop unfortunately. It should be possible to write one, but noone has done it yet.