Hello FPC-Pascal, Thursday, May 6, 2010, 7:12:46 PM, you wrote:
>>> If I remember this correctly, I've formerly ever read somewhere (in >>> my Delphi days) that array should be declared globally (not inside a >>> function or procedure) so that access to the array will be faster. Is >>> this correct? >> No. WVB> That's a brief answer. How is what he is saying not true ? WVB> A global variable can be allocated in the datasegment, meaning that the WVB> compiler knows at comiletime what address to look for. If you allocate WVB> things dynamically then you need to follow an extra pointer, so placing WVB> an array in the datasegment would indeed speed up things afaik ? If not, WVB> more than a blunt 'no' would be appreciated, Static arrays. Main difference is the scope. If you declare it in the function, the array is not accesible outside while the global one is errrr... global :) Both have not allocation time, the global is allocated at compile time and the local one is allocated when calling the function increasing the stack pointer, but as the stack pointer must be increased also to perform the call, there is no penalty. Dynamic arrays are different or arrays that needs an initialization, but anyway using global ones you must initialize them to be reused. -- Best regards, José _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
