Am 13.04.2017 13:25 schrieb "MARCOU Gilles" <g.mar...@unistra.fr>: > > Regarding this code: > >> SetLength(Array,Length(Array)+1); >> Array[High(Array)] := … > > > as I understood from (http://wiki.freepascal.org/Dynamic_array), SetLength will create a copy of the array and free the memory of the shorter array. In this case, a lot of memory operations and copy operations are performed thus degrading the performances of the code. Then it would be unwise to use such strategy: better allocate the size of the array correctly at the beginning of the run, or resize the array by block, to decrease the frequency of such operation: > >> SetLength(Array,Length(Array)+N); > > > Can somebody confirm (or invalidate) this?
SetLength() uses reallocation for the memory. So it *might* work without copying though that is not guaranteed. But in general it's recommended anyway not to do "SetLength(..., ... + 1)" loops as that will lead to fragmentation of the heap. Regards Sven
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