http://llvm.org/bugs/show_bug.cgi?id=16983
Bug ID: 16983
Summary: decltype(-9223372036854775808) is unsigned instead of
signed
Product: clang
Version: trunk
Hardware: Macintosh
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
#include <limits>
#include <memory>
#include <iostream>
#include <cxxabi.h>
#include <cstdlib>
template <typename T>
std::string
type_name()
{
typedef typename std::remove_reference<T>::type TR;
std::unique_ptr<char, void(*)(void*)> own
(
abi::__cxa_demangle(typeid(TR).name(), nullptr,
nullptr, nullptr),
std::free
);
std::string r = own != nullptr ? own.get() : typeid(TR).name();
if (std::is_const<TR>::value)
r += " const";
if (std::is_volatile<TR>::value)
r += " volatile";
if (std::is_lvalue_reference<T>::value)
r += "&";
else if (std::is_rvalue_reference<T>::value)
r += "&&";
return r;
}
int
main()
{
std::cout << std::numeric_limits<long long>::min() << '\n';
std::cout << -9223372036854775808 << '\n';
std::cout << static_cast<long long>(0x8000000000000000) << '\n';
std::cout << type_name<decltype(-9223372036854775808)>() << '\n';
}
I expect this program to compile and output:
-9223372036854775808
-9223372036854775808
-9223372036854775808
long long
or:
-9223372036854775808
-9223372036854775808
-9223372036854775808
long
(latter ok only in 64 bit mode).
Instead I'm getting a warning:
test.cpp:35:19: warning: integer constant is so large that it is unsigned
std::cout << -9223372036854775808 << '\n';
^
test.cpp:37:38: warning: integer constant is so large that it is unsigned
std::cout << type_name<decltype(-9223372036854775808)>() << '\n';
^
2 warnings generated.
And the output is:
-9223372036854775808
9223372036854775808
-9223372036854775808
unsigned long long
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
LLVMbugs mailing list
[email protected]
http://lists.cs.uiuc.edu/mailman/listinfo/llvmbugs
