intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 55 insertions, 0 deletions

diff --git a/util/generic/mem_copy.h b/util/generic/mem_copy.h
new file mode 100644
index 0000000000..b68c852953
--- /dev/null
+++ b/util/generic/mem_copy.h
@@ -0,0 +1,55 @@
+#pragma once
+
+#include "typetraits.h"
+
+#include <util/system/types.h>
+
+#include <cstring>
+
+template <class T>
+using TIfPOD = std::enable_if_t<TTypeTraits<T>::IsPod, T*>;
+
+template <class T>
+using TIfNotPOD = std::enable_if_t<!TTypeTraits<T>::IsPod, T*>;
+
+template <class T>
+static inline TIfPOD<T> MemCopy(T* to, const T* from, size_t n) noexcept {
+    if (n) {
+        memcpy(to, from, n * sizeof(T));
+    }
+
+    return to;
+}
+
+template <class T>
+static inline TIfNotPOD<T> MemCopy(T* to, const T* from, size_t n) {
+    for (size_t i = 0; i < n; ++i) {
+        to[i] = from[i];
+    }
+
+    return to;
+}
+
+template <class T>
+static inline TIfPOD<T> MemMove(T* to, const T* from, size_t n) noexcept {
+    if (n) {
+        memmove(to, from, n * sizeof(T));
+    }
+
+    return to;
+}
+
+template <class T>
+static inline TIfNotPOD<T> MemMove(T* to, const T* from, size_t n) {
+    if (to <= from || to >= from + n) {
+        return MemCopy(to, from, n);
+    }
+
+    //copy backwards
+    while (n) {
+        to[n - 1] = from[n - 1];
+        --n;
+    }
+
+    return to;
+}