ISO/IEC 10514-3:1998 情報技術—プログラミング言語—パート3：オブジェクト指向Modula-2 | ページ 2

1.1 目標

基本言語の目標に加えて、ISO/IEC 10514 のこの部分の目標は、国際規格 ISO/IEC 10514-1 で定義されている基本言語にオブジェクト指向プログラミング機能を変更せずに追加できるようにする単純な拡張機能を提供することです。 Base Language で許可されている有効なプログラムの意味 (この標準で導入された新しいキーワードの使用を除く。5 節を参照)

3.1 定義

ISO/IEC 10514 のこの部分の目的のために、基本規格に含まれるすべての定義が適用されます。追加の定義は必要ありません。

Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.

In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote.

International Standard ISO/IEC 10514-3 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 22, Programming languages, their environments and system software interfaces.

ISO/IEC 10514 consists of the following parts, under the general title Information technology — Programming languages:

• Part 1: Modula-2, Base Language
• Part 2: Generics in Modula-2
• Part 3: Object Oriented Modula-2

Annexes A to F of this part of ISO/IEC 10514 are for information only.

Introduction

This part of ISO/IEC 10514 is part three of the multi-part standard ISO/IEC 10514 and specifies the form and meaning of Object Oriented Modula-2 programs and by reference to that specification lays down requirements for Object Oriented Modula-2 implementations.

The reader is referred to International Standard ISO/IEC 10514-1 (the first part of this multipart standard, herein referred to as"the Base Standard") for introductory remarks on the programming language Modula-2.

This part of ISO/IEC 10514 defines Object Oriented Modula-2 by additions to the Base Language without changing the meaning of any parts of the Base Language (except for the introduction of new keywords—see clause 5).

This part of ISO/IEC 10514 does not provide a formal specification of Object Oriented Modula-2, although it is the intention of WG13 to construct the appropriate VDM-SL descriptions for the syntax and semantics described herein when committee resources permit.

Rationale

Object oriented programming is a method of programming that allows a high degree of abstraction as well as good structuring of programs. Because of its substantial benefits it has become a common method of programming.

As Modula-2 in its original design provides for basic facilities necessary for object orientation (like data encapsulation and modularization), full object oriented facilities can be easily added to the base language in a very natural way. Thus the advantages of this new programming method are made available to the programmer in a fully upward compatible way.

1 Scope

1.2 Specifications included in this part of ISO/IEC 10514

In addition to the specifications included in the Base Language this part of ISO/IEC 10514 provides specifications for:

• required symbols for Object Oriented Modula-2 programs;
• the lexical structure, the syntactic structure and semantics of Object Oriented Modula-2 programs;
• the interface to and the semantics of Object Oriented Modula-2 system modules;
• violations of the rules for the use of the object oriented extensions that a conforming implementation is required to detect;
• further compliance requirements for implementations, including documentation requirements.

1.3 Relationship to ISO/IEC 10514-1

This part of ISO/IEC 10514 is part three of the multi-part standard ISO/IEC 10514. This part of ISO/IEC 10514 extends and modifies the Base Language ISO/IEC 10514-1, but the adoption of this part of ISO/IEC 10514 is optional with respect to the Base Language. This part of ISO/IEC 10514 is also independent of any other parts of ISO/IEC 10514 except for part 1, and can be adopted either together with or independently of such other parts.

1.4 Specifications not within the scope of this part of ISO/IEC 10514

In addition to the categories of specifications excluded by the Base Language this part of ISO/IEC 10514 provides no specifications for:

• the internal representation of the objects and their associated methods;
• the implementation of the garbage collector;
• the implementation of the tracking mechanism for traced objects.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.

3 Definitions, Structure, and Conventions

3.2 Structure of the Formal Definition

This part of ISO/IEC 10514 states its requirements in the same form as the Base Language with the exception that it does not include formal expression of semantics in VDM-SL at this time.

3.3 Conventions

The conventions used in this part of ISO/IEC 10514 are to be interpreted in the same way as in the Base Language with the exception that this document does not include VDM-SL at this time.