What is translated > Routines > Translation modes

Delphi Interface mode

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This translation mode is used for Delphi-style interfaces, including interfaces derived from IInterface.

It represents a Delphi-oriented interface model that may be COM-compatible internally, but preserves Delphi semantics and usage patterns.

Characteristics

Interfaces

Portable compilers (MSVC, GCC, Clang):

mapped to DelphiInterface<T>

C++Builder:

mapped to DelphiInterface<T> or native C++Builder interface types

Types

Boolean -> bool

Standard Delphi types are preserved (no Windows API type substitution)

Parameters

var / out -> T& (reference)

Calling convention

Portable compilers:

default calling convention

C++Builder:

usually __fastcall (Delphi-compatible)

General Behavior

•	Preserves Delphi-style interface usage

•	Uses reference semantics instead of pointer-based API patterns

•	Does not enforce COM ABI requirements (such as HRESULT return values or __stdcall)

Example

Delphi

function GetIsRecyclable: Boolean;

C++ (Portable)

bool GetIsRecyclable();

C++ (C++Builder)

bool __fastcall GetIsRecyclable();

Notes

Even if an interface is technically COM-based, this mode is selected when:

•	the method follows Delphi-style signatures

•	no native COM ABI pattern is detected

Typical indicators include:

•	return values instead of HRESULT

•	absence of stdcall / safecall

•	use of Delphi-specific types

This page belongs to the Delphi2Cpp Documentation

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