feat: import std; support added

Resolves #595

test/runtime/atomic_test.cpp

@@ -21,7 +21,11 @@
 // SOFTWARE.
 
 #include <catch2/catch_test_macros.hpp>
+#ifdef MP_UNITS_IMPORT_STD
+import std;
+#else
 #include <atomic>
+#endif
 #ifdef MP_UNITS_MODULES
 import mp_units;
 #else

test/runtime/distribution_test.cpp

@@ -21,12 +21,16 @@
 // SOFTWARE.
 
 #include <catch2/catch_test_macros.hpp>
+#ifdef MP_UNITS_IMPORT_STD
+import std;
+#else
 #include <array>
 #include <cstddef>
 #include <cstdint>
 #include <initializer_list>
 #include <random>
 #include <vector>
+#endif
 #ifdef MP_UNITS_MODULES
 import mp_units;
 #else

test/runtime/fixed_string_test.cpp

@@ -24,8 +24,12 @@
 #include <catch2/matchers/catch_matchers_exception.hpp>
 #include <mp-units/compat_macros.h>
 #include <mp-units/ext/format.h>
+#ifdef MP_UNITS_IMPORT_STD
+import std;
+#else
 #include <sstream>
 #include <string_view>
+#endif
 #ifdef MP_UNITS_MODULES
 import mp_units;
 #else

test/runtime/fmt_test.cpp

@@ -25,6 +25,9 @@
 #include <catch2/matchers/catch_matchers_exception.hpp>
 #include <mp-units/compat_macros.h>
 #include <mp-units/ext/format.h>
+#ifdef MP_UNITS_IMPORT_STD
+import std;
+#else
 #include <cstdint>
 #include <iomanip>
 #include <limits>
@@ -32,6 +35,7 @@
 #include <sstream>
 #include <string>
 #include <string_view>
+#endif
 #ifdef MP_UNITS_MODULES
 import mp_units;
 #else

test/runtime/linear_algebra_test.cpp

@@ -23,8 +23,12 @@
 #include <catch2/catch_test_macros.hpp>
 #include <mp-units/compat_macros.h>
 #include <mp-units/ext/format.h>
+#ifdef MP_UNITS_IMPORT_STD
+import std;
+#else
 #include <matrix>
 #include <ostream>
+#endif
 #ifdef MP_UNITS_MODULES
 import mp_units;
 #else

test/runtime/math_test.cpp

@@ -23,7 +23,11 @@
 #include "almost_equals.h"
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/matchers/catch_matchers.hpp>
+#ifdef MP_UNITS_IMPORT_STD
+import std;
+#else
 #include <limits>
+#endif
 #ifdef MP_UNITS_MODULES
 import mp_units;
 #else

test/runtime/truncation_test.cpp

@@ -25,8 +25,12 @@
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/matchers/catch_matchers.hpp>
 #include <mp-units/ext/format.h>
+#ifdef MP_UNITS_IMPORT_STD
+import std;
+#else
 #include <limits>
 #include <numbers>
+#endif
 #ifdef MP_UNITS_MODULES
 import mp_units;
 #else