support for empty structures in flat_* methods, slightly more compact streaming operators

README.md

@@ -124,7 +124,7 @@ auto flat_tie(T& val, typename std::enable_if< std::is_trivially_assignable<T, T
 /// Example usage: 
 ///     struct my_struct { int i, short s; };
 ///     my_struct s{12, 13};
-///     flat_write(std::cout, s); // outputs '{ 12, 13 }'
+///     flat_write(std::cout, s); // outputs '{12, 13}'
 template <class Char, class Traits, class T>
 void flat_write(std::basic_ostream<Char, Traits>& out, const T& value);
 
@@ -134,7 +134,7 @@ void flat_write(std::basic_ostream<Char, Traits>& out, const T& value);
 ///     struct my_struct { int i, short s; };
 ///     my_struct s;
 ///     std::stringstream ss;
-///     ss << "{ 12, 13 }";
+///     ss << "{12, 13}";
 ///     ss >> s;
 ///     assert(s.i == 12);
 ///     assert(s.i == 13);
@@ -152,7 +152,7 @@ void flat_read(std::basic_istream<Char, Traits>& in, T& value);
 ///     comparable_struct s1 {0, 1, "Hello", false, 6,7,8,9,10,11};
 ///     comparable_struct s2 {0, 1, "Hello", false, 6,7,8,9,10,11111};
 ///     assert(s1 < s2);
-///     std::cout << s1 << std::endl;   // Outputs: { 0, 1, H, e, l, l, o, , , 0, 6, 7, 8, 9, 10, 11 }
+///     std::cout << s1 << std::endl;   // Outputs: {0, 1, H, e, l, l, o, , , 0, 6, 7, 8, 9, 10, 11}
 namespace pod_ops;
 ```