From d30fcb8fffd04dd7ac6d67719902471a6cd969ae Mon Sep 17 00:00:00 2001
From: Jason Smith <jason.inet@gmail.com>
Date: Fri, 5 Apr 2024 17:24:58 -0700
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20Fix=20bool=20evalution=20of=20XY?=
 =?UTF-8?q?val=20and=20similar=20types=20(#26936)?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Require explicit cast to get T* pointers from XYval and similar types. This prevents the pointer from being implicitly returned and checked for nullptr when trying to evaluate these structs in boolean expressions.
---
 Marlin/src/core/types.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/Marlin/src/core/types.h b/Marlin/src/core/types.h
index e67644e52fc6..44805e130a56 100644
--- a/Marlin/src/core/types.h
+++ b/Marlin/src/core/types.h
@@ -449,7 +449,7 @@ struct XYval {
   // Length reduced to one dimension
   FI constexpr T magnitude()    const { return (T)sqrtf(x*x + y*y); }
   // Pointer to the data as a simple array
-  FI operator T* ()                   { return pos; }
+  explicit FI operator T* ()          { return pos; }
   // If any element is true then it's true
   FI constexpr operator bool()  const { return x || y; }
   // Smallest element
@@ -599,7 +599,7 @@ struct XYZval {
   // Length reduced to one dimension
   FI constexpr T magnitude()    const { return (T)TERN(HAS_X_AXIS, sqrtf(NUM_AXIS_GANG(x*x, + y*y, + z*z, + i*i, + j*j, + k*k, + u*u, + v*v, + w*w)), 0); }
   // Pointer to the data as a simple array
-  FI operator T* ()                   { return pos; }
+  explicit FI operator T* ()          { return pos; }
   // If any element is true then it's true
   FI constexpr operator bool()  const { return 0 NUM_AXIS_GANG(|| x, || y, || z, || i, || j, || k, || u, || v, || w); }
   // Smallest element
@@ -747,7 +747,7 @@ struct XYZEval {
   // Length reduced to one dimension
   FI constexpr T magnitude()    const { return (T)sqrtf(LOGICAL_AXIS_GANG(+ e*e, + x*x, + y*y, + z*z, + i*i, + j*j, + k*k, + u*u, + v*v, + w*w)); }
   // Pointer to the data as a simple array
-  FI operator T* ()                   { return pos; }
+  explicit FI operator T* ()          { return pos; }
   // If any element is true then it's true
   FI constexpr operator bool()  const { return 0 LOGICAL_AXIS_GANG(|| e, || x, || y, || z, || i, || j, || k, || u, || v, || w); }
   // Smallest element