Re: Explicit specialization in non-namespace scope
"robert.caldecott" <robert.caldecott@gmail.com> writes:
I am getting a 'explicit specialization in non-namespace scope' error
with gcc when attempting to compile the following:
class foo
{
public:
template <typename T>
foo& operator<<(const T& t)
{
...
return *this;
}
// Specialization for std::string
template <>
foo& operator<<(const std::string& str)
{
...
return *this;
}
};
gcc is correct. Member template specializations have to be made in the
namespace that the class belongs to.
The above compiles fine using MSC. It appears I can workaround this
issue by moving the template code outside of foo, e.g.:
class foo
{
public:
...
};
template <typename T>
foo& operator<<(foo& f, const T& t)
{
...
return f;
}
// Specialization for std::string
template <>
foo& operator<<(foo& t, const std::string& str)
{
...
return f;
}
Are there any other workarounds other than the one above? Is it MSC
or GCC at fault here? I have quite a lot of specialization code
that I need to port.
We are not talking about workarounds here, but fixes. This would be
the correct version of your original attempt:
class foo
{
public:
template <typename T>
foo& operator<<(const T& t)
{
return *this;
}
};
// Specialization for std::string
template <>
foo& foo::operator<<(const std::string& str)
{
return *this;
}
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