refactor: hello_units fixed to provide literals and references preprocessor defines explicitly

README.md

@@ -28,6 +28,8 @@ analysis and unit/quantity manipulation. The basic idea and design heavily bases
 Here is a small example of possible operations:
 
 ```cpp
+#define UNITS_REFERENCES
+
 #include <units/isq/si/area.h>
 #include <units/isq/si/frequency.h>
 #include <units/isq/si/length.h>
@@ -64,6 +66,9 @@ and dimensional analysis can be performed without sacrificing on accuracy. Pleas
 the below example for a quick preview of basic library features:
 
 ```cpp
+#define UNITS_REFERENCES
+#define UNITS_LITERALS
+
 #include <units/format.h>
 #include <units/isq/si/length.h>
 #include <units/isq/si/speed.h>

docs/quick_start.rst

@@ -3,6 +3,8 @@ Quick Start
 
 Here is a small example of possible operations::
 
+    #define UNITS_REFERENCES
+
     #include <units/isq/si/area.h>
     #include <units/isq/si/frequency.h>
     #include <units/isq/si/length.h>
@@ -40,6 +42,9 @@ but still easy to use interface where all unit conversions and dimensional analy
 performed without sacrificing on accuracy. Please see the below example for a quick preview
 of basic library features::
 
+    #define UNITS_REFERENCES
+    #define UNITS_LITERALS
+
     #include <units/format.h>
     #include <units/isq/si/length.h>
     #include <units/isq/si/speed.h>

example/CMakeLists.txt

@@ -28,7 +28,3 @@ add_subdirectory(references)
 
 add_executable(hello_units hello_units.cpp)
 target_link_libraries(hello_units PRIVATE mp-units::core-fmt mp-units::core-io mp-units::si mp-units::si-international)
-target_compile_definitions(hello_units PRIVATE
-    UNITS_REFERENCES
-    UNITS_LITERALS
-)

example/hello_units.cpp

@@ -20,6 +20,9 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
+#define UNITS_REFERENCES
+#define UNITS_LITERALS
+
 #include <units/format.h>
 #include <units/isq/si/international/length.h>
 #include <units/isq/si/international/speed.h> // IWYU pragma: keep