On 03/01/2013 05:15 AM, Ulrich Drepper wrote:
On Thu, Feb 21, 2013 at 12:38 PM, Benjamin De Kosnik <b...@redhat.com> wrote:
Not seeing it.
Say for:
#include <iostream>
// A class for math constants.
template<typename _RealType>
struct __math_constants
{
// Constant @f$ \pi @f$.
static constexpr _RealType __pie =
3.1415926535897932384626433832795029L; };
template<class T>
void print(const T& t) { std::cout << t; }
int main()
{
print(__math_constants<double>::__pie);
return 0;
}
I'm not getting any definition, even at -O0.
Even more so: how would an explicit instantiation even work?
You don't need an explicit instantiation, just a regular templated
definition. This example shows that a definition is needed, and how one
is provided.
template <class T>
struct a {
static constexpr T m = T(1);
};
template <class T>
constexpr T a<T>::m;
const int *
f()
{
return &a<int>::m;
}
int
main()
{
return f() == 0;
}
--
Florian Weimer / Red Hat Product Security Team
