openFrameworks / ImGui add ofParamaters as c++ types. plain ImGui without ofxImGui

ofApp.cpp

//h
ofParameter<float> _edgeSlope;

//convert string to char pointer
string _str = parameter.getName();
const char * _name(_str.c_str());

/cpp
//setup
_edgeSlope.set("edgeSlope", 0.3f, 0.0f, 1.0f);

//add param as plain ImGui
if (ImGui::SliderFloat("edgeSlope", (float *)&_edgeSlope.get(), _edgeSlope.getMin(), _edgeSlope.getMax()))
{
    cout <<_edgeSlope.get()<<endl;
}