template <typename T,int SIZE>
    class Vector
    {
      public:
        Vector(T a){
            LOKI_STATIC_CHECK(SIZE>=1,NotBigEnough);//why you use a Vector of size zero ?
            Value[0]=a;
            for (int i=1;i<SIZE;++i)
                Value[i]=0;
        }

namespace CML {
/** A workaround to use static assertions without C++. Use with the STATIC_ASSERT macro. */
template<int> struct StaticAssertion;
template<> struct StaticAssertion<true> { };

#define STATIC_ASSERT(expression, message) \
    { CML::StaticAssertion<((expression) != 0)> ASSERTION_##message; }
}

int main(int argc, char **argv) {
   STATIC_ASSERT(5 == 6, Hier_ist_etwas_faul);     // obiges Makro
   static_assert(5 == 6, "Hier ist etwas faul.");  // C++0x Assertion
   return 0;
}

[coolcat@q9300 cml]$ g++ -std=c++0x -o test main.cpp
main.cpp: In function ‘int main(int, char**)’:
main.cpp:26:1: error: aggregate ‘CML::StaticAssertion<0> ASSERTION_Hier_ist_etwas_faul’ has incomplete type and cannot be defined
main.cpp:27:2: error: static assertion failed: "Hier ist etwas faul."
[coolcat@q9300 cml]$