refactor: systems defined in terms of SI moved under si namespace

example/avg_speed.cpp

@@ -20,9 +20,9 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-#include <units/physical/cgs/speed.h>
+#include <units/physical/si/cgs/speed.h>
+#include <units/physical/si/international/speed.h>
 #include <units/physical/si/speed.h>
-#include <units/physical/international/speed.h>
 #include <iostream>
 
 namespace {
@@ -97,7 +97,7 @@ void example()
 
   // Customary Units (int)
   {
-    using namespace units::physical::international::literals;
+    using namespace units::physical::si::international::literals;
     constexpr Length auto distance = 140_q_mi;     // constructed from a UDL
     constexpr si::time<si::hour, int> duration(2); // constructed from a value
 
@@ -113,7 +113,7 @@ void example()
 
   // Customary Units (double)
   {
-    using namespace units::physical::international::literals;
+    using namespace units::physical::si::international::literals;
     constexpr Length auto distance = 140._q_mi; // constructed from a UDL
     constexpr si::time<si::hour> duration(2);   // constructed from a value
 
@@ -131,9 +131,9 @@ void example()
 
   // CGS (int)
   {
-    using namespace units::physical::cgs::literals;
+    using namespace units::physical::si::cgs::literals;
     constexpr Length auto distance = 22'000'000_q_cm; // constructed from a UDL
-    constexpr cgs::time<si::hour, int> duration(2);   // constructed from a value
+    constexpr si::cgs::time<si::hour, int> duration(2);   // constructed from a value
 
     std::cout << "\nCGS units with 'int' as representation\n";
 
@@ -150,9 +150,9 @@ void example()
 
   // CGS (double)
   {
-    using namespace units::physical::cgs::literals;
+    using namespace units::physical::si::cgs::literals;
     constexpr Length auto distance = 22'000'000._q_cm; // constructed from a UDL
-    constexpr cgs::time<si::hour> duration(2);         // constructed from a value
+    constexpr si::cgs::time<si::hour> duration(2);     // constructed from a value
 
     std::cout << "\nCGS units with 'double' as representation\n";