Cannot instantiate abstract class using 0.9.0: Visual Studio 2015 on Windows 8.1

The same code that compiled using Visual Studio 2012 and 0.8.4 will not compile with Visual Studio 2015 and 0.9.0:

This seems to me to be some kind of syntax issue. The 4 methods which the compiler is complaining about can be seen below. Does anyone know the syntax Visual Studio 2015 is looking for?

ofx*.cpp(46): error C2259: ‘ofx*’: cannot instantiate abstract class
1> …\addons\ofxI\libs\src\ofx.cpp(46): note: due to following members:
1> …\addons\ofxI\libs\src\ofx.cpp(46): note: ‘void ofBaseDraws::draw(float,float,float,float) const’: is abstract
1> …of_v0.9.0_vs_release\libs\openFrameworks\types\ofBaseTypes.h(75): note: see declaration of ‘ofBaseDraws::draw’

1> …\addons\ofxI\libs\src\ofx.cpp(46): note: ‘void ofBaseDraws::draw(float,float) const’: is abstract
1> …of_v0.9.0_vs_release\libs\openFrameworks\types\ofBaseTypes.h(67): note: see declaration of ‘ofBaseDraws::draw’

1> …\addons\ofxI\libs\src\ofx.cpp(46): note: ‘float ofBaseDraws::getHeight(void) const’: is abstract
1> …of_v0.9.0_vs_release\libs\openFrameworks\types\ofBaseTypes.h(104): note: see declaration of ‘ofBaseDraws::getHeight’

1> …\addons\ofxI\libs\src\ofx.cpp(46): note: ‘float ofBaseDraws::getWidth(void) const’: is abstract
1> …of_v0.9.0_vs_release\libs\openFrameworks\types\ofBaseTypes.h(108): note: see declaration of ‘ofBaseDraws::getWidth’

Sorry, but must admit finding the answer myself (embarrassed):

Found convention in: of_v0.9.0_vs_release\libs\openFrameworks\gl\ofTexture.h:

using ofBaseDraws::draw;

void draw(float x, float y) const;
void draw(float x, float y, float w, float h) const;
float getHeight() const;
float getWidth() const;

//*** and in ofTexture.cpp:

void draw(float x, float y) {

}
void draw(float x, float y, float w, float h) {

}
float getHeight() {
return height;
}
float getWidth() {
return width;
}