range-v3 dependency removed for gcc-10

conanfile.py

@@ -47,10 +47,11 @@ class UnitsConan(ConanFile):
     exports_sources = ["src/*", "test/*", "cmake/*", "example/*","CMakeLists.txt"]
     settings = "os", "compiler", "build_type", "arch"
     requires = (
-        "range-v3/0.9.1@ericniebler/stable",
-        "Catch2/2.10.0@catchorg/stable",
         "fmt/6.0.0"
     )
+    build_requires = (
+        "Catch2/2.10.0@catchorg/stable"
+    )
     generators = "cmake"
 
     @property
@@ -73,6 +74,10 @@ class UnitsConan(ConanFile):
             cmake.configure(source_folder="src", build_folder="src")
         return cmake
 
+    def requirements(self):
+        if Version(self.settings.compiler.version) < "10":
+            self.requires("range-v3/0.10.0@ericniebler/stable")
+
     def build(self):
         cmake = self._configure_cmake()
         cmake.build()

src/CMakeLists.txt

@@ -53,7 +53,6 @@ add_library(units INTERFACE)
 target_compile_features(units INTERFACE cxx_std_20)
 target_link_libraries(units
     INTERFACE
-        CONAN_PKG::range-v3
         CONAN_PKG::fmt
 )
 target_include_directories(units
@@ -71,6 +70,11 @@ if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
             -Wno-pedantic
     )
     if(CMAKE_CXX_COMPILER_VERSION VERSION_LESS 10.0)
+        target_link_libraries(units
+            INTERFACE
+                CONAN_PKG::range-v3
+        )
+
         target_compile_options(units
             INTERFACE
                 -fconcepts

src/include/units/bits/hacks.h

@@ -22,7 +22,6 @@
 
 #pragma once
 
-#include <concepts/concepts.hpp>
 #include <functional>
 
 #ifdef NDEBUG
@@ -32,16 +31,24 @@
 #define Expects(cond) assert(cond);
 #endif
 
-#if __GNUC__ > 9
-#define AUTO auto
-#define SAME_AS(T) std::same_as<T>
-#else
+#if __GNUC__ < 10
+
+#include <concepts/concepts.hpp>
 #define AUTO
 #define SAME_AS(T) T
+
+#else
+
+#include <concepts>
+#define AUTO auto
+#define SAME_AS(T) std::same_as<T>
+
 #endif
 
 namespace std {
 
+#if __GNUC__ < 10
+
   // concepts
   using concepts::common_reference_with;
   using concepts::common_with;
@@ -64,4 +71,11 @@ namespace std {
   template<class F, class... Args>
   concept regular_invocable = invocable<F, Args...>;
 
-}
+#else
+
+template<class T>
+concept default_constructible = constructible_from<T>;
+
+#endif
+
+} // namespace std

src/include/units/math.h

@@ -28,8 +28,8 @@
 namespace units {
 
   template<std::size_t N, typename D, typename U, typename Rep>
-    requires N == 0
-  inline Rep AUTO pow(const quantity<D, U, Rep>&) noexcept
+    requires (N == 0)
+  inline Rep pow(const quantity<D, U, Rep>&) noexcept
   {
     return 1;
   }

test/unit_test/static/dimension_op_test.cpp

@@ -111,7 +111,7 @@ static_assert(std::is_same_v<
               unknown_dimension<exp<d0, 1>, exp<d2, 1>>>);
 static_assert(std::is_same_v<dimension_multiply<derived_dimension<exp<d0, 1>>, derived_dimension<exp<d0, -1>>>,
                              unknown_dimension<>>);
-static_assert(std::is_same_v<dimension_multiply<derived_dimension<exp<d0, 2>>, unknown_dimension<exp<d0, -1>>>, d0>);
+static_assert(std::is_same_v<dimension_multiply<derived_dimension<exp<d0, 2>>, derived_dimension<exp<d0, -1>>>, d0>);
 
 // dimension_divide