[cfe-dev] Proposed C++ optimization with big speed gains with big objects

[Ladislav Nevery]

ups here is beter example that actually reflects your case with working
optimization enabled.

TextFile textfile[1000] 

textfile[1]=TextFile("a.txt"); // = we call destructor doing nothing 
and placement new for first assign = we skip alloc/copy
textfile[2]=TextFile("b.txt"); // = we call destructor doing nothing 
and placement new for first assign = we skip alloc/copy again
textfile[1] = textfile[2]; //copy the content of b.txt in a.txt.
optimization disabled due to not first assign anymore 



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