Developers frequently add timing code to existing routines to compare their relative speed. I did the same a few times in examples in Part I of the book, to figure out the speed of Unicode strings. Supposing you have two code fragments and you want to compare their speed by executing them a few million times, you could write the following (which is taken from the String-Convert example of Chapter 2 and discussed in the section "Converting Strings):
Sender: TObject); var stri: string; str2: AnsiString; I: Integer; ti: TDateTime; begi n stri := 'Marco Cantò'; ti := Now;
for I := 1 to MaxLoop2 do stri := AnsiUpperCase (stri); ti := now - ti;
Memoi.Lines.Add ('AnsiUpperCase (string): ' + FormatDateTime( 'nn:ss.zzz', ti));
for I := i to MaxLoop2 do str2 := AnsiUpperCase (str2); ti := now - ti;
Memoi.Lines.Add ('AnsiUpperCase (AnsiString): ' + FormatDateTime( 'nn:ss.zzz', ti));
Rather than repeating the timing code over and over, you can write a function with the timing code that would invoke the code snippet through a parameterless anonymous method:
function TimeCode (nLoops: Integer; proc: TProc): string; var ti: TDateTime; I: Integer; begi n ti := Now;
procedure TFormAnonTiming.btnAnonClick(Sender: TObject); var stri: string; str2: AnsiString;
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