On Friday, 26 July 2019 at 03:42:58 UTC, Andrey Zherikov wrote:
Is there a way to check whether some module, say "foo", is
available for import before doing "import foo"?
I want to create a function that imports module if it's
available or does something else otherwise. So I think the code
should look something like this:
mixin template my_import(alias module_name)
{
if(module_name is available)
mixin("import "~module_name~";");
else
pragma(msg, module_name~" is not available");
}
mixin my_import!("std.stdio"); // == import std.stdio
mixin my_import!("unknown_module"); // == pragma(msg,
"unknown_module is not available")
version(HasStdio)
import std.stdio;
else
pragma(msg, "std.stdio is not available");
Then configure your build system to pass `-version=HasStdio` to
dmd (or the equivalent flag to ldc or gdc) when std.stdio is
available.
