Move nextafter polyfill to polyfills.hpp

src/catch2/internal/catch_polyfills.cpp

@@ -31,4 +31,12 @@ namespace Catch {
     }
 #endif
 
+#if !defined( CATCH_CONFIG_GLOBAL_NEXTAFTER )
+    float nextafter( float x, float y ) { return std::nextafter( x, y ); }
+    double nextafter( double x, double y ) { return std::nextafter( x, y ); }
+#else
+    float nextafter( float x, float y ) { return ::nextafterf( x, y ); }
+    double nextafter( double x, double y ) { return ::nextafter( x, y ); }
+#endif
+
 } // end namespace Catch

src/catch2/internal/catch_polyfills.hpp

@@ -9,8 +9,13 @@
 #define CATCH_POLYFILLS_HPP_INCLUDED
 
 namespace Catch {
+
     bool isnan(float f);
     bool isnan(double d);
+
+    float nextafter(float x, float y);
+    double nextafter(double x, double y);
+
 }
 
 #endif // CATCH_POLYFILLS_HPP_INCLUDED

src/catch2/matchers/catch_matchers_floating_point.cpp

@@ -38,26 +38,11 @@ namespace {
         return ulpDist <= maxUlpDiff;
     }
 
-#if defined(CATCH_CONFIG_GLOBAL_NEXTAFTER)
-
-    float nextafter(float x, float y) {
-        return ::nextafterf(x, y);
-    }
-
-    double nextafter(double x, double y) {
-        return ::nextafter(x, y);
-    }
-
-#endif // ^^^ CATCH_CONFIG_GLOBAL_NEXTAFTER ^^^
 
 template <typename FP>
 FP step(FP start, FP direction, uint64_t steps) {
     for (uint64_t i = 0; i < steps; ++i) {
-#if defined(CATCH_CONFIG_GLOBAL_NEXTAFTER)
         start = Catch::nextafter(start, direction);
-#else
-        start = std::nextafter(start, direction);
-#endif
     }
     return start;
 }