MSVC 2015 compatibility: more constexpr delegating constructor issues.

src/Magnum/ImageView.h

@@ -108,7 +108,11 @@ template<UnsignedInt dimensions> class ImageView {
         /** @overload
          * Similar to the above, but uses default @ref PixelStorage parameters.
          */
-        constexpr explicit ImageView(PixelFormat format, PixelType type, const VectorTypeFor<dimensions, Int>& size) noexcept: ImageView{{}, format, type, size} {}
+        #ifndef CORRADE_MSVC2015_COMPATIBILITY
+        /* Can't use delegating constructors with constexpr -- https://connect.microsoft.com/VisualStudio/feedback/details/1579279/c-constexpr-does-not-work-with-delegating-constructors */
+        constexpr
+        #endif
+        explicit ImageView(PixelFormat format, PixelType type, const VectorTypeFor<dimensions, Int>& size) noexcept: ImageView{{}, format, type, size} {}
 
         /** @brief Storage of pixel data */
         PixelStorage storage() const { return _storage; }
@@ -237,7 +241,11 @@ template<UnsignedInt dimensions> class CompressedImageView {
          * Similar the above, but uses default @ref CompressedPixelStorage
          * parameters (or the hardcoded ones in OpenGL ES and WebGL).
          */
-        constexpr explicit CompressedImageView(CompressedPixelFormat format, const VectorTypeFor<dimensions, Int>& size, Containers::ArrayView<const void> data) noexcept;
+        #ifndef CORRADE_MSVC2015_COMPATIBILITY
+        /* Can't use delegating constructors with constexpr -- https://connect.microsoft.com/VisualStudio/feedback/details/1579279/c-constexpr-does-not-work-with-delegating-constructors */
+        constexpr
+        #endif
+        explicit CompressedImageView(CompressedPixelFormat format, const VectorTypeFor<dimensions, Int>& size, Containers::ArrayView<const void> data) noexcept;
 
         #ifndef MAGNUM_TARGET_GLES
         /**
@@ -356,7 +364,12 @@ template<UnsignedInt dimensions> constexpr CompressedImageView<dimensions>::Comp
     _format{format}, _size{size} {}
 
 #ifndef MAGNUM_TARGET_GLES
-template<UnsignedInt dimensions> constexpr CompressedImageView<dimensions>::CompressedImageView(const CompressedPixelFormat format, const VectorTypeFor<dimensions, Int>& size, const Containers::ArrayView<const void> data) noexcept: CompressedImageView{{}, format, size, data} {}
+template<UnsignedInt dimensions>
+#ifndef CORRADE_MSVC2015_COMPATIBILITY
+/* Can't use delegating constructors with constexpr -- https://connect.microsoft.com/VisualStudio/feedback/details/1579279/c-constexpr-does-not-work-with-delegating-constructors */
+constexpr
+#endif
+CompressedImageView<dimensions>::CompressedImageView(const CompressedPixelFormat format, const VectorTypeFor<dimensions, Int>& size, const Containers::ArrayView<const void> data) noexcept: CompressedImageView{{}, format, size, data} {}
 
 template<UnsignedInt dimensions> constexpr CompressedImageView<dimensions>::CompressedImageView(const CompressedPixelFormat format, const VectorTypeFor<dimensions, Int>& size) noexcept: CompressedImageView{{}, format, size} {}
 #endif

src/Magnum/Test/ArrayTest.cpp

@@ -51,7 +51,11 @@ void ArrayTest::construct() {
     constexpr Array<3, Int> a = {5, 6, 7};
     CORRADE_COMPARE(a, (Array<3, Int>(5, 6, 7)));
 
-    constexpr Array<3, Int> a2 = 5;
+    #ifndef CORRADE_MSVC2015_COMPATIBILITY
+    /* Can't use delegating constructors with constexpr -- https://connect.microsoft.com/VisualStudio/feedback/details/1579279/c-constexpr-does-not-work-with-delegating-constructors */
+    constexpr
+    #endif
+    Array<3, Int> a2 = 5;
     CORRADE_COMPARE(a2, (Array<3, Int>(5, 5, 5)));
 
     constexpr Array1D b = 5;