Compilation error

[wabu06]

Got this compilation error:

src/imgui-SFML.cpp:955:28: error: invalid operands to binary expression ('ImTextureRef' and 'std::nullptr_t')
955 | assert(io.Fonts->TexID != /(ImTextureID)/ nullptr); // You forgot to create and set font texture
| ~~~~~~~~~~~~~~~ ^ ~~~~~~~
/usr/include/assert.h:138:27: note: expanded from macro 'assert'
138 | (static_cast (expr) \

[yudin-s]

That error looks like a Dear ImGui version mismatch rather than the font texture actually being missing.

Current imgui-sfml still has this check in imgui-SFML.cpp:

assert(io.Fonts->TexID != (ImTextureID) nullptr);

Its CMake file asks for ImGui 1.91.1. Dear ImGui 1.92 changed the texture API: TexID now goes through ImTextureRef, while (ImTextureID) nullptr is the older integer/pointer texture-id shape. That is why the compiler reports an ImTextureRef versus null/ImTextureID comparison instead of a runtime font-texture failure.

The quickest fix is to build ImGui-SFML against a 1.91.x Dear ImGui checkout/release, or use an ImGui-SFML revision/branch that explicitly supports ImGui 1.92. I would not only patch this assert locally, because 1.92 also changed the draw-command texture fields to the newer TexRef path, so the renderer needs matching API changes too.

Check the ImGui version actually found through IMGUI_DIR; it may be picking a system or latest ImGui checkout instead of the version you expected.