File1.cpp: void Component::initialize()
File1.cpp: {
File1.cpp:     my_component = new ComponentClass();
File1.cpp: }

File2.cpp: void Component::initialize()
File2.cpp: {
File2.cpp:     if (doInit)
File2.cpp:     {
File2.cpp:         my_component = new ComponentClass();
File2.cpp:     }
File2.cpp:     else
File2.cpp:     {
File2.cpp:         my_component.ptr = null;
File2.cpp:     }
File2.cpp: }

File3.cpp: /* A third file, containing the function to be replaced */
File3.cpp: void Component::initialize()
File3.cpp: {
File3.cpp:     my_component = new ComponentClass();
File3.cpp: }

File1.cpp with STXs for LFs:
void Component::initialize()^B{^B    my_component = new ComponentClass();^B}^B

Replacement made:
/* A third file, containing the function to be replaced */^Bvoid Component::initialize()^B{^B    if (doInit)^B    {^B        my_component = new ComponentClass();^B    }^B    else^B    {^B        my_component.ptr = null;^B    }^B}^B

Final result, STXes converted back to LFs:
/* A third file, containing the function to be replaced */
void Component::initialize()
{
    if (doInit)
    {
        my_component = new ComponentClass();
    }
    else
    {
        my_component.ptr = null;
    }
}