On 4/29/21 9:02 AM, novice2 wrote:
> format() can throw.
In order to throw for an int, I added a foo(x) expression to prove that
the code works.
> I don't want embrace format into try..catch block,
> and i found elegant std.exception.ifThrown.
There are collectException and collectExceptionMsg as well. The
following code works for 42 and uses the default string "error" for 43.
int foo(int x) {
import std.exception : enforce;
enforce(x == 42, "some error");
return x;
}
nothrow string foo(int x, string def) {
import std.format: format;
import std.exception: collectException;
string result;
auto exc = collectException(format("%d", foo(x)), result);
return (exc is null) ? result : def;
}
void main() {
import std.stdio: writeln;
writeln(foo(42, "error"));
writeln(foo(43, "error"));
}
Ali
