Editor: Unary operator- for ImVec2 is defined by ImGui since r18955

Author: thedmd

docs/CHANGELOG.txt

@@ -14,6 +14,10 @@ v0.9.2 (WIP):
 
     CHANGE: Canvas: Don't use deprecated SetItemAllowOverlap (#250)
 
+    CHANGE: Editor: Define IMGUI_DEFINE_MATH_OPERATORS before <imgui.h> (#209), thanks @ocornut
+
+    CHANGE: Editor: Unary operator- for ImVec2 is defined by ImGui since r18955 (#248)
+
     BUGFIX: Editor: Correctly initialize 'width' for view resize code (thx @gnif)
 
     BUGFIX: Examples: Handle node deletion before links (#182)

imgui_extra_math.inl

@@ -34,10 +34,12 @@ inline ImVec2 operator*(const float lhs, const ImVec2& rhs)
     return ImVec2(lhs * rhs.x, lhs * rhs.y);
 }
 
+# if IMGUI_VERSION_NUM < 18955
 inline static ImVec2 operator-(const ImVec2& lhs)
 {
     return ImVec2(-lhs.x, -lhs.y);
 }
+# endif
 
 
 //------------------------------------------------------------------------------