Globally defined and statically checked block size for pool allocator

libuavcan/include/uavcan/internal/impl_constants.hpp

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2014 Pavel Kirienko <pavel.kirienko@gmail.com>
+ */
+
+#pragma once
+
+#include <uavcan/internal/static_assert.hpp>
+
+namespace uavcan
+{
+
+/**
+ * Should be OK for any target arch up to AMD64 and any compiler.
+ * The library leverages compile-time checks to ensure that all types that are subject to dynamic allocation
+ * fit this size; otherwise compilation fails.
+ */
+#if UAVCAN_MEM_POOL_BLOCK_SIZE
+enum { MEM_POOL_BLOCK_SIZE = UAVCAN_MEM_POOL_BLOCK_SIZE };
+#else
+enum { MEM_POOL_BLOCK_SIZE = 48 };
+#endif
+
+enum { MEM_POOL_ALIGNMENT = 8 };
+
+typedef char _alignment_check_for_MEM_POOL_BLOCK_SIZE[((MEM_POOL_BLOCK_SIZE & (MEM_POOL_ALIGNMENT - 1)) == 0) ? 1 : -1];
+
+template <typename T>
+struct AssertDynamicallyAllocatable
+{
+    static void check() { StaticAssert<sizeof(T) <= MEM_POOL_BLOCK_SIZE>::check(); }
+};
+
+}