refactor: quantity_io added

example/alternative_namespaces/box_example.cpp

@@ -1,4 +1,5 @@
 
+#include <units/quantity_io.h>
 #include "./length.h"
 #include "./acceleration.h"
 #include "./density.h"

example/alternative_namespaces/capacitor_time_curve.cpp

@@ -24,6 +24,7 @@
 #include <units/physical/si/derived/resistance.h>
 #include <units/physical/si/base/time.h>
 #include <units/math.h>
+#include <units/quantity_io.h>
 #include "./voltage.h"
 #include <iostream>
 

example/alternative_namespaces/clcpp_response.cpp

@@ -17,6 +17,7 @@
 
 #include <iostream>
 #include <units/format.h>
+#include <units/quantity_io.h>
 
 #include "./length.h"
 #include "./volume.h"

example/alternative_namespaces/conversion_factor.cpp

@@ -18,6 +18,7 @@
 
 #include "./units_str.h"
 #include "./length.h"
+#include <units/quantity_io.h>
 #include <iostream>
 
 /*

example/alternative_namespaces/timer.cpp

@@ -1,4 +1,5 @@
 
+#include <units/quantity_io.h>
 #include <iostream>
 #include "./timer.h"
 

example/avg_speed.cpp

@@ -23,6 +23,7 @@
 #include <units/physical/si/cgs/derived/speed.h>
 #include <units/physical/si/international/derived/speed.h>
 #include <units/physical/si/derived/speed.h>
+#include <units/quantity_io.h>
 #include <iostream>
 
 namespace {

example/box_example.cpp

@@ -7,6 +7,7 @@
 #include <units/physical/si/base/time.h>
 #include <units/physical/si/derived/volume.h>
 #include <units/format.h>
+#include <units/quantity_io.h>
 #include <cassert>
 
 namespace {

example/capacitor_time_curve.cpp

@@ -25,6 +25,7 @@
 #include <units/physical/si/base/time.h>
 #include <units/physical/si/derived/voltage.h>
 #include <units/math.h>
+#include <units/quantity_io.h>
 #include <iostream>
 
 int main()

example/clcpp_response.cpp

@@ -25,6 +25,7 @@
 #include <units/physical/si/typographic/base/length.h>
 #include <units/physical/si/us/base/length.h>
 #include <units/physical/si/derived/volume.h>
+#include <units/quantity_io.h>
 #include <iostream>
 
 namespace {

example/conversion_factor.cpp

@@ -17,6 +17,7 @@
 
 #include <units/physical/si/base/length.h>
 #include <units/format.h>
+#include <units/quantity_io.h>
 #include <iostream>
 
 /*

example/custom_systems.cpp

@@ -20,7 +20,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-#include <units/quantity.h>
+#include <units/quantity_io.h>
 #include <units/physical/si/prefixes.h>
 #include <iostream>
 

example/experimental_angle.cpp

@@ -25,6 +25,7 @@
 #include <units/physical/si/base/length.h>
 #include <units/physical/si/derived/energy.h>
 #include <units/physical/si/derived/torque.h>
+#include <units/quantity_io.h>
 #include <iostream>
 
 using namespace units;

example/hello_units.cpp

@@ -23,6 +23,7 @@
 #include <units/format.h>
 #include <units/physical/si/international/derived/speed.h>
 #include <units/physical/si/derived/speed.h>
+#include <units/quantity_io.h>
 #include <iostream>
 
 using namespace units::physical;

example/linear_algebra.cpp

@@ -24,13 +24,14 @@
 #include <units/physical/si/derived/force.h>
 #include <units/physical/si/derived/energy.h>
 #include <units/format.h>
+#include <units/quantity_io.h>
 #include <linear_algebra.hpp>
 #include <iostream>
 
-namespace {
+namespace STD_LA {
 
 template<class ET, class OT>
-std::ostream& operator<<(std::ostream& os, const std::math::vector<ET, OT>& v)
+std::ostream& operator<<(std::ostream& os, const vector<ET, OT>& v)
 {
   os << "|";
   for (auto i = 0U; i < v.size(); ++i) {
@@ -41,7 +42,7 @@ std::ostream& operator<<(std::ostream& os, const std::math::vector<ET, OT>& v)
 }
 
 template<class ET, class OT>
-std::ostream& operator<<(std::ostream& os, const std::math::matrix<ET, OT>& v)
+std::ostream& operator<<(std::ostream& os, const matrix<ET, OT>& v)
 {
   for (auto i = 0U; i < v.rows(); ++i) {
     os << "|";
@@ -53,6 +54,9 @@ std::ostream& operator<<(std::ostream& os, const std::math::matrix<ET, OT>& v)
   return os;
 }
 
+}  // namespace STD_LA
+
+namespace {
 
 using namespace units::physical;
 using namespace units::physical::si::literals;
@@ -345,7 +349,7 @@ void quantity_of_matrix_tests()
   quantity_of_matrix_divide_by_scalar();
 }
 
-}
+}  // namespace
 
 int main()
 {

example/measurement.cpp

@@ -21,6 +21,7 @@
 // SOFTWARE.
 
 #include <units/physical/si/derived/acceleration.h>
+#include <units/quantity_io.h>
 #include <cmath>
 #include <compare>
 #include <iostream>

example/total_energy.cpp

@@ -26,6 +26,7 @@
 #include <units/physical/si/derived/speed.h>
 #include <units/physical/si/constants.h>
 #include <units/math.h>
+#include <units/quantity_io.h>
 #include <iostream>
 
 namespace {

example/unknown_dimension.cpp

@@ -21,6 +21,7 @@
 // SOFTWARE.
 
 #include <units/physical/si/derived/speed.h>
+#include <units/quantity_io.h>
 #include <iostream>
 
 namespace {