http://llvm.org/bugs/show_bug.cgi?id=20430
Bug ID: 20430
Summary: Improper handling of pointers to arrays as template
parameters
Product: clang
Version: 3.4
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
The following code outputs 1 instead of 5, as if the template parameter were
decaying to "const char *" instead of being the proper "const char (*)[5]":
#include <cstdio>
template <const char (*STR)[5]>
unsigned TestBug()
{
return sizeof(*STR);
}
extern const char g_meow[5] = "meow";
int main()
{
std::printf("%u\n", TestBug<&g_meow>());
return 0;
}
This works correctly if TestBug were to take STR as a runtime parameter,
including constexpr functions evaluated at compile time. For example, the
following code prints 5:
#include <cstdio>
constexpr unsigned TestBug(const char (*STR)[5])
{
return sizeof(*STR);
}
extern const char g_meow[5] = "meow";
template <unsigned N>
struct Number
{
enum ValueType : unsigned { Value = N };
};
int main()
{
std::printf("%u\n",
static_cast<unsigned>(Number<TestBug(&g_meow)>::Value));
return 0;
}
This is all possibly related to bug 6226 or its fix, from the description of
that bug.
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