Weird ImGui::InputText behavior when encapsulated inside a struct

[deadlocklogic]

Version/Branch of Dear ImGui:

Version 1.90.0, Branch: docking

Back-ends:

imgui_impl_sdl2.cpp + imgui_impl_opengl3.cpp

Compiler, OS:

Windows 11 + clang

Full config/build information:

Dear ImGui 1.90.0 (19000)
--------------------------------
sizeof(size_t): 8, sizeof(ImDrawIdx): 2, sizeof(ImDrawVert): 20
define: __cplusplus=199711
define: _WIN32
define: _WIN64
define: _MSC_VER=1939
define: _MSVC_LANG=201402
define: IMGUI_HAS_VIEWPORT
define: IMGUI_HAS_DOCK
--------------------------------
io.BackendPlatformName: imgui_impl_sdl2
io.BackendRendererName: imgui_impl_opengl3
io.ConfigFlags: 0x00000443
 NavEnableKeyboard
 NavEnableGamepad
 DockingEnable
 ViewportsEnable
io.ConfigViewportsNoDecoration
io.ConfigInputTextCursorBlink
io.ConfigWindowsResizeFromEdges
io.ConfigMemoryCompactTimer = 60.0
io.BackendFlags: 0x00001C06
 HasMouseCursors
 HasSetMousePos
 PlatformHasViewports
 HasMouseHoveredViewport
 RendererHasViewports
--------------------------------
io.Fonts: 1 fonts, Flags: 0x00000000, TexSize: 512,64
io.DisplaySize: 1280.00,720.00
io.DisplayFramebufferScale: 1.00,1.00
--------------------------------
style.WindowPadding: 8.00,8.00
style.WindowBorderSize: 1.00
style.FramePadding: 4.00,3.00
style.FrameRounding: 0.00
style.FrameBorderSize: 0.00
style.ItemSpacing: 8.00,4.00
style.ItemInnerSpacing: 4.00,4.00

Details:

When creating 2 text structures like below, when updating one, the other acts like a clone.

Screenshots/Video:

Screen.Recording.2024-06-23.003937.mp4

Minimal, Complete and Verifiable Example code:

Consider:

struct Text {
     Text(const std::string& label, const std::string& str) :label(label), str(str) {}

    void update() {
        ImGui::InputText(label.c_str(), &str);
    }

    std::string label;
    std::string str;
};

Initialization with:

    Text t1("", "Text1");
    Text t2("", "Text2");

And updating with:

    t1.update();
    t2.update();

[deadlocklogic]

I just wanted to ask before doing any further investigations. Especially this variant of ImGui::InputText() is defined inside imgui_stblib.h.

[ocornut]

Your identifiers are the same.
See https://github.com/ocornut/imgui/blob/master/docs/FAQ.md#q-about-the-id-stack-system

[deadlocklogic]

Indeed, sorry my bad, I was aware of IDs but thought they are automatically managed!
Anyway thank you for you time.