ImGuiIO& io = ImGui::GetIO(); (void)io; io.Fonts->AddFontFromFileTTF("C:\\Windows\\Fonts\\Arial.ttf", 15.0f, NULL, io.Fonts->GetGlyphRangesCyrillic());
std :: string str ; bool bDigits = ( str . find_first_not_of ( "0123456789" ) == std :: string :: npos ) ;