From 2c049ae06dbbdfff7542c23ca4d748879f4beb71 Mon Sep 17 00:00:00 2001
From: FearlessTobi <thm.frey@gmail.com>
Date: Thu, 18 Jan 2024 23:08:37 +0100
Subject: fs: Add path class

---
 src/common/overflow.h | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/common/overflow.h')

diff --git a/src/common/overflow.h b/src/common/overflow.h
index 44d8e7e73..e765c0d89 100644
--- a/src/common/overflow.h
+++ b/src/common/overflow.h
@@ -19,4 +19,21 @@ inline T WrappingAdd(T lhs, T rhs) {
     return BitCast<T>(lhs_u + rhs_u);
 }
 
+template <typename T>
+    requires(std::is_integral_v<T> && std::is_signed_v<T>)
+inline bool CanAddWithoutOverflow(T lhs, T rhs) {
+#ifdef _MSC_VER
+    if (lhs >= 0 && rhs >= 0) {
+        return WrappingAdd(lhs, rhs) >= std::max(lhs, rhs);
+    } else if (lhs < 0 && rhs < 0) {
+        return WrappingAdd(lhs, rhs) <= std::min(lhs, rhs);
+    } else {
+        return true;
+    }
+#else
+    T res;
+    return !__builtin_add_overflow(lhs, rhs, &res);
+#endif
+}
+
 } // namespace Common
-- 
cgit v1.2.3


From 975deb7528cd98460528553f6a9162bfbcd6cab1 Mon Sep 17 00:00:00 2001
From: FearlessTobi <thm.frey@gmail.com>
Date: Fri, 19 Jan 2024 00:17:28 +0100
Subject: Address review comments and fix compilation problems

---
 src/common/overflow.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src/common/overflow.h')

diff --git a/src/common/overflow.h b/src/common/overflow.h
index e765c0d89..e184ead95 100644
--- a/src/common/overflow.h
+++ b/src/common/overflow.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <algorithm>
 #include <type_traits>
 #include "bit_cast.h"
 
-- 
cgit v1.2.3