gistfile1.txt

static inline fstring operator%(const fstring & lhs, float4 rhs) {
    std::string fs = lhs.next_fmt("f");
    fs = (fstring("(%s, %s, %s, %s)")% fs % fs % fs % fs).str();
    return lhs.append((fstring(fs)% rhs.x % rhs.y % rhs.z % rhs.w).str());
}