Added more Heap allocator stub functions.

Moved platform api includes into mimir_impl.h

src/heap.cpp

@@ -32,19 +32,6 @@
 #include "../include/mimir.h"
 #include "mimir_impl.h"
 
-#if defined(__unix__) || defined(__APPLE__) || defined(ANDROID)
-#include <unistd.h>
-#include <sys/mman.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#endif
-
-#if defined(_WIN32) || defined(_WIN64)
-#include <Windows.h>
-#include <memoryapi.h>
-#endif
-
-#include <errno.h>
 #include <cassert>
 #include <cstring>
 #include <bit>
@@ -59,4 +46,27 @@ Heap::~Heap()
 {
 }
 
+bool Heap::init(size_t minSize, size_t maxSize)
+{
+  return false; // not implemented
+}
+
+// Allocate `size` bytes
+std::byte* Heap::alloc(size_t size)
+{
+  return nullptr; // not implemented
+}
+
+// Allocate `size` bytes, aligned to 16 bytes and padded to next 16-byte offset.
+std::byte* Heap::allocA16(size_t size)
+{
+  return nullptr; // not implemented
+}
+
+// Allocate `size` bytes, aligned to 64 bytes and padded to next 64-byte offset.
+std::byte* Heap::allocA64(size_t size)
+{
+  return nullptr; // not implemented
+}
+
 } // namespace mimir