feat: add module mp_units

example/storage_tank.cpp

@@ -20,6 +20,16 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
+#include <mp-units/bits/fmt_hacks.h>
+#include <mp-units/quantity_spec_macro.h>
+#include <cassert>
+#include <chrono>
+#include <iostream>
+#include <numbers>
+#include <utility>
+#ifdef MP_UNITS_MODULES
+import mp_units;
+#else
 #include <mp-units/chrono.h>
 #include <mp-units/format.h>
 #include <mp-units/math.h>
@@ -28,11 +38,7 @@
 #include <mp-units/systems/si/constants.h>
 #include <mp-units/systems/si/unit_symbols.h>
 #include <mp-units/systems/si/units.h>
-#include <cassert>
-#include <chrono>
-#include <iostream>
-#include <numbers>
-#include <utility>
+#endif
 
 // allows standard gravity (acceleration) and weight (force) to be expressed with scalar representation
 // types instead of requiring the usage of Linear Algebra library for this simple example