std::string get_text_input(std::size_t arbitrary_size)
{
    std::vector<char> txt(arbitrary_size+1); // set aside space

    ImGui::Begin("Window");
    ImGui::InputTextMultiline("Textbox", buf.data(), arbitrary_size, ImVec2(-1.0f, ImGui::GetTextLineHeight() * 16), ImGuiInputTextFlags_AllowTabInput | (read_only ? ImGuiInputTextFlags_ReadOnly : 0));
    ImGui::End();

    return buf.data(); // will construct retval string
}