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As part of a traits class for a larger program, I attempted to create a static class variable which could have a different value depending on the type that the enclosing class template was instantiated with. I've simplified the relevant code to produce a bare-bones example of what I'm talking about: #include <iostream> #include <string> #include <type_traits> template <class T, class Enable = void> struct Foo; template <class T> struct Foo<T, typename std::enable_if<std::is_integral<T>::value>::type > { static std::string message; }; template <class T> struct Foo<T, typename std::enable_if<std::is_floating_point<T>::value>::type > { static std::string message; }; template <class T, class Enable> std::string Foo<T, Enable>::message; With GCC 4.6, this gives a compiler error: template definition of non-template ‘std::string Foo<T, Enable>::message . The problem occurs because of the last two lines, where I'm just defining the static variable std::string Foo<T, Enable>::message . I'm confused why this is happening. The compiler error goes away if I omit the last two lines (but of course that causes linker errors.) Is this a compiler error with GCC?

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