BLI: improve constructors and conversions to span

This allows us to avoid many calls to `as_span()` methods. I will
remove those in the next commit. Furthermore, constructors
of Vector and Array can convert from one type to another now.

I tested these changes on Linux with gcc and on Windows.

3 files changed, 51 insertions, 1 deletions

diff --git a/tests/gtests/blenlib/BLI_memory_utils_test.cc b/tests/gtests/blenlib/BLI_memory_utils_test.cc
index eb896c0cca6..b99db5c5eca 100644
--- a/tests/gtests/blenlib/BLI_memory_utils_test.cc
+++ b/tests/gtests/blenlib/BLI_memory_utils_test.cc
@@ -1,5 +1,6 @@
 /* Apache License, Version 2.0 */
 
+#include "BLI_float3.hh"
 #include "BLI_memory_utils.hh"
 #include "BLI_strict_flags.h"
 #include "testing/testing.h"
@@ -119,4 +120,40 @@ TEST(memory_utils, UninitializedFillN_StrongExceptionSafety)
   EXPECT_EQ(MyValue::alive, 0);
 }
 
+class TestBaseClass {
+  virtual void mymethod(){};
+};
+
+class TestChildClass : public TestBaseClass {
+  void mymethod() override
+  {
+  }
+};
+
+static_assert(is_convertible_pointer_v<int *, int *>);
+static_assert(is_convertible_pointer_v<int *, const int *>);
+static_assert(is_convertible_pointer_v<int *, int *const>);
+static_assert(is_convertible_pointer_v<int *, const int *const>);
+static_assert(!is_convertible_pointer_v<const int *, int *>);
+static_assert(!is_convertible_pointer_v<int, int *>);
+static_assert(!is_convertible_pointer_v<int *, int>);
+static_assert(is_convertible_pointer_v<TestBaseClass *, const TestBaseClass *>);
+static_assert(!is_convertible_pointer_v<const TestBaseClass *, TestBaseClass *>);
+static_assert(is_convertible_pointer_v<TestChildClass *, TestBaseClass *>);
+static_assert(!is_convertible_pointer_v<TestBaseClass *, TestChildClass *>);
+static_assert(is_convertible_pointer_v<const TestChildClass *, const TestBaseClass *>);
+static_assert(!is_convertible_pointer_v<TestBaseClass, const TestChildClass *>);
+static_assert(!is_convertible_pointer_v<float3, float *>);
+static_assert(!is_convertible_pointer_v<float *, float3>);
+static_assert(!is_convertible_pointer_v<int **, int *>);
+static_assert(!is_convertible_pointer_v<int *, int **>);
+static_assert(is_convertible_pointer_v<int **, int **>);
+static_assert(is_convertible_pointer_v<const int **, const int **>);
+static_assert(!is_convertible_pointer_v<const int **, int **>);
+static_assert(!is_convertible_pointer_v<int *const *, int **>);
+static_assert(!is_convertible_pointer_v<int *const *const, int **>);
+static_assert(is_convertible_pointer_v<int **, int **const>);
+static_assert(is_convertible_pointer_v<int **, int *const *>);
+static_assert(is_convertible_pointer_v<int **, int const *const *>);
+
 }  // namespace blender
diff --git a/tests/gtests/blenlib/BLI_vector_test.cc b/tests/gtests/blenlib/BLI_vector_test.cc
index 1f6bd1ded5b..92fb12fb4e5 100644
--- a/tests/gtests/blenlib/BLI_vector_test.cc
+++ b/tests/gtests/blenlib/BLI_vector_test.cc
@@ -59,6 +59,18 @@ TEST(vector, InitializerListConstructor)
   EXPECT_EQ(vec[3], 6);
 }
 
+TEST(vector, ConvertingConstructor)
+{
+  std::array<float, 5> values = {5.4f, 7.3f, -8.1f, 5.0f, 0.0f};
+  Vector<int> vec = values;
+  EXPECT_EQ(vec.size(), 5u);
+  EXPECT_EQ(vec[0], 5);
+  EXPECT_EQ(vec[1], 7);
+  EXPECT_EQ(vec[2], -8);
+  EXPECT_EQ(vec[3], 5);
+  EXPECT_EQ(vec[4], 0);
+}
+
 struct TestListValue {
   TestListValue *next, *prev;
   int value;
diff --git a/tests/gtests/functions/FN_attributes_ref_test.cc b/tests/gtests/functions/FN_attributes_ref_test.cc
index 1c05bb930db..fee8c5dc058 100644
--- a/tests/gtests/functions/FN_attributes_ref_test.cc
+++ b/tests/gtests/functions/FN_attributes_ref_test.cc
@@ -65,7 +65,8 @@ TEST(mutable_attributes_ref, ComplexTest)
   Array<float> sizes(amount);
   Array<std::string> names(amount);
 
-  Array<void *> buffers = {positions.data(), ids.data(), sizes.data(), names.data()};
+  Array<void *> buffers = {
+      (void *)positions.data(), (void *)ids.data(), (void *)sizes.data(), (void *)names.data()};
   MutableAttributesRef attributes{info, buffers, IndexRange(1, 3)};
   EXPECT_EQ(attributes.size(), 3);
   EXPECT_EQ(attributes.info().size(), 4);