I am converting the Delphi expression seen below to C++Builder. My C++Builder code generates the error message E2299. I put the full text for this error description below. Can you recommend a change to my C++ code to get this working.
//Delphi
TYPE
Regions = (North,South,East,West);
RegionSet = SET OF Regions;
//C++Builder
enum Regions { North, South, East, West };
typedef Set<Regions, North, West> RegionSet;
E2299 Cannot generate template specialization from 'Set'
You need to add a property to your program.
The declaration of a property specifies a name and a type, and includes at least one access specifier. The syntax of a property declaration is:
property propertyName[indexes]: type index integerConstant specifiers;
where:
propertyName is any valid identifier
[indexes] is optional and is a sequence of parameter declarations separated by semicolons
Each parameter declaration has the form identifier1, ..., identifiern: type
type must be a predefined or previously declared type identifier. That is, property declarations like property Num: 0..9 ... are invalid.
the index integerConstant clause is optional.
specifiers is a sequence of read, write, stored, default (or nodefault), and implements specifiers.
Every property declaration must have at least one read or write specifier.
edit below:
The problem was the typedef seen below would not compile inside a C++Builder function. I had the typedef setup in the CheckRegion function.
void __fastcall TForm1::CheckRegion( bool visible ){
//C++Builder
enum Regions { North, South, East, West };
typedef Set<Regions, North, West> RegionSet;
}
The solution was to move the typedef to the top of the main form just below TForm1 *Form1; like seen below.
//--------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
// use "typedef" here
enum RegionsCpp {NorthCpp, SouthCpp, EastCpp, WestCpp };
typedef Set<RegionsCpp, NorthCpp, WestCpp> RegionSetCpp;
//--------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner): TForm(Owner)
{
You are using the typedef Set ...
at the wrong place.
You can use typedef Set <...
if you using NOT a local enum Regions
//---------------------------------------------------------------------------
void __fastcall TForm1::FormClick(TObject *Sender)
{
enum Regions {North, South, East, West };
// You can use "enum" here, but not "typedef Set <..."
typedef Set<Regions, North, West> RegionSet;
// next typedef is OK
typedef int NumberOfParts;
}
Delphi you can use TYPE here without problems
procedure TForm1.FormClick(Sender: TObject);
TYPE
Regions = (North, South, East, West );
RegionSet = SET OF Regions;
begin
[...]
end;
C++ Builder following will work
#include <vcl.h>
#pragma hdrstop
#include "Enum.h"
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
enum Regions {North, South, East, West };
// use "typedef" here
typedef Set<Regions, North, West> RegionSet;
// also works
// typedef System::Set<Regions, North, West> RegionSet;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
: TForm(Owner)
{
}
//---------------------------------------------------------------------------
void __fastcall TForm1::FormClick(TObject *Sender)
{
[...]
}
You can use typedef Set <...
if you using a global enum Regions
#include <vcl.h>
[...]
TForm1 *Form1;
enum Regions {North, South, East, West };
[...]
//--------------------------------------------------------------
void __fastcall TForm1::FormClick(TObject *Sender)
{
typedef Set<Regions, North, West> RegionSet;
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.