From b4b12914a130c7896d9818df429b704fb61a6ff9 Mon Sep 17 00:00:00 2001
From: Philip Rideout <philiprideout@gmail.com>
Date: Mon, 3 Dec 2018 14:18:38 -0800
Subject: [PATCH] Add bitcast to utils.

---
 libs/utils/include/utils/algorithm.h | 12 ++++++++++++
 tools/filamesh/src/main.cpp          |  6 +-----
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/libs/utils/include/utils/algorithm.h b/libs/utils/include/utils/algorithm.h
index 988d1b9d07..c05c6d43b7 100644
--- a/libs/utils/include/utils/algorithm.h
+++ b/libs/utils/include/utils/algorithm.h
@@ -255,6 +255,18 @@ RandomAccessIterator partition_point(
     return first;
 }
 
+template <class To, class From>
+typename std::enable_if_t<
+    (sizeof(To) == sizeof(From)) &&
+    std::is_trivially_copyable<From>::value &&
+    std::is_trivial<To>::value,
+    // this implementation requires that To is trivially default constructible
+    To>
+// constexpr support needs compiler magic
+bit_cast(const From &src) noexcept {
+    return reinterpret_cast<const To&>(src);
+}
+
 } // namespace utils
 
 #endif // TNT_UTILS_ALGORITHM_H
diff --git a/tools/filamesh/src/main.cpp b/tools/filamesh/src/main.cpp
index 99c5d4ebb0..d3e3eb5179 100644
--- a/tools/filamesh/src/main.cpp
+++ b/tools/filamesh/src/main.cpp
@@ -25,6 +25,7 @@
 #include <math/quat.h>
 #include <math/vec3.h>
 
+#include <utils/algorithm.h>
 #include <utils/Path.h>
 
 #include <filameshio/filamesh.h>
@@ -50,11 +51,6 @@ Mesh g_mesh;
 float2 g_minUV = float2(std::numeric_limits<float>::max());
 float2 g_maxUV = float2(-std::numeric_limits<float>::max());
 
-template <class Dest, class Source>
-inline Dest bit_cast(const Source& source) {
-    return *reinterpret_cast<const Dest*>(&source);
-}
-
 template<bool SNORMUVS>
 static ushort2 convertUV(float2 uv) {
     if (SNORMUVS) {