Bug #7719
Convert a cpp17::any with unsigned long to a string always throws.
0%
Description
The following code always throws:
Wt::cpp17::any value = 4ul;
auto s = Wt::asString(value);
because you try to cast value to the type long instead of unsigned long what leads to an exception.
Updated by Roel Standaert 4 months ago
What platform is this on? It's working fine on Linux 64 bit, but maybe the issue is specific to 32 bit, I'll have to check that.
Updated by Andreas Frolov 4 months ago
I tested on Windows 32 bit, but I wonder that it works somewhere.
This is your code:
@ } else if (v.type() typeid(unsigned long)) {
if (sizeof(long) 4) {
if (format.empty())
return WLocale::currentLocale().toString
((unsigned)cpp17::any_cast(v));
else {
char buf[100];
snprintf(buf, 100, format.toUTF8().c_str(),
(unsigned)cpp17::any_cast(v));
return WString::fromUTF8(buf);
}
} else {
if (format.empty())
return WLocale::currentLocale()
.toString((::uint64_t)cpp17::any_cast(v));
else {
char buf[100];
snprintf(buf, 100, format.toUTF8().c_str(),
(::uint64_t)cpp17::any_cast(v));
return WString::fromUTF8(buf);
}
}
}@
All cases in this block try to execute any_cast with wrong type.
Updated by Roel Standaert 4 months ago
I just tested on Windows and found the issue myself. I'm fixing it. I think on Linux 64 bit it takes a different code path since there unsigned long is synonymous with uint64_t.
Updated by Andreas Frolov 4 months ago
You only fixed 2 out of 4 cases. I think an exception is still thrown on OSX (else case).
https://stackoverflow.com/questions/36814040/osx-vs-linux-how-to-deal-with-unsigned-long-and-uint64-t