I'm working on some legacy C++ code, and ran into an interesting
problem with some templates. I am not a language lawyer, so I wanted
to see if anyone could offer an opinion on this.
Basically the template is instantiated using a pointer to a struct.
If the pointer is to a const struct, I get bizarre and unhelpful
errors when compiling under Xcode 2.3:
templatetest.cpp:18: error: missing ‘>’ to terminate the template
argument list
templatetest.cpp:18: error: template argument 1 is invalid
templatetest.cpp:18: error: expected initializer before ‘>’ token
Through luck, I discovered that when I use a non-const struct, things
compile fine.
My reduced example is below:
------
typedef struct testStruct
{
long a;
} testStruct;
template <const testStruct * bob> class Helper
{
};
// this compiles
testStruct nonConstTestStruct = {0};
Helper<&nonConstTestStruct> HelperNonConst;
// this doesn't
const testStruct constTestStruct = {0};
Helper<&constTestStruct> HelperConst;
-----
Presumably it is harder for the compiler to deal with the const
example, as const variables can be coalesced by the linker. Still, if
the non-const struct is a valid argument, I would expect the const
struct to also be a valid argument. If not, a better error message
from GCC would be useful.
I have also filed a bug (#4608585)
- Ladd
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