函数重载重载的思想很简单:编译器允许你用同一名字定义多个函数或过程,只要它们所带的参数不同.实际上,编译器是通过检测参数来确定需要调用的例程.下面是从VCL 的数学单元(Math Unit)中摘录的一系列函数: function Min (A,B: Integer): Integer; overload; function Min (A,B: Int64): Int64; overload; function Min (A,B: Single): Single; overload; functi…
function GetcdsAccountsData: OleVariant; var ASQLQuery: TSQLQuery; Adsp: TProvider; begin ASQLQuery:=CreateSQLQuery; Adsp:=TProvider.Create(nil); with ASQLQuery do try SQL.Add('Select AccID, pAccID, AccName, AccFullName, Explan, Grade, Property, Deta…
摘自:stackoverflow.com/questions/24232799/why-choose-struct-over-class Structure instances are always passed by value, and class instances are always passed by reference. This means that they are suited to different kinds of tasks. As you consider the…