From 37820651bb4f22e316f00a02e4bf5da2589a03c9 Mon Sep 17 00:00:00 2001
From: Jacques Lucke <jacques@blender.org>
Date: Tue, 30 Jun 2020 15:58:14 +0200
Subject: BLI: add Array constructor that does not initialize non-trivial types

This should rarely be necessary, but I have a use case coming up soon.
---
 tests/gtests/blenlib/BLI_array_test.cc | 35 ++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

(limited to 'tests')

diff --git a/tests/gtests/blenlib/BLI_array_test.cc b/tests/gtests/blenlib/BLI_array_test.cc
index 9ff4dc9a371..08f61a19900 100644
--- a/tests/gtests/blenlib/BLI_array_test.cc
+++ b/tests/gtests/blenlib/BLI_array_test.cc
@@ -124,3 +124,38 @@ TEST(array, TrivialTypeSizeConstructor)
   EXPECT_EQ(*ptr, magic);
   delete array;
 }
+
+struct ConstructibleType {
+  char value;
+
+  ConstructibleType()
+  {
+    value = 42;
+  }
+};
+
+TEST(array, NoInitializationSizeConstructor)
+{
+  using MyArray = Array<ConstructibleType>;
+
+  AlignedBuffer<sizeof(MyArray), alignof(MyArray)> buffer;
+  char *buffer_ptr = (char *)buffer.ptr();
+  memset(buffer_ptr, 100, sizeof(MyArray));
+
+  /* Doing this to avoid some compiler optimization. */
+  for (uint i : IndexRange(sizeof(MyArray))) {
+    EXPECT_EQ(buffer_ptr[i], 100);
+  }
+
+  {
+    MyArray &array = *new (buffer.ptr()) MyArray(1, NoInitialization());
+    EXPECT_EQ(array[0].value, 100);
+    array.clear_without_destruct();
+    array.~Array();
+  }
+  {
+    MyArray &array = *new (buffer.ptr()) MyArray(1);
+    EXPECT_EQ(array[0].value, 42);
+    array.~Array();
+  }
+}
-- 
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