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imho, the main problem is , that you're omitting the smartpointers there, so your 'raw' pointer is already deadbeef on line 1.

so, in the end it should be :

Ptr<Blender> blender = Blender::createDefault(Blender::FEATHER, false);

// 3.0 has dynamiccast:
// Ptr<FeatherBlender> fb = blender.dynamicCast<FeatherBlender>();

// 2.4 does it simply like this:
Ptr<FeatherBlender> fb(blender);

fb->setSharpness(1.f/20);