POP-2

**POP-2**
	函数式，面向堆栈
設計者	Robin Popplestone，Rod Burstall
	1970年
啟發語言
	COWSEL，ALGOL 60，ISWIM
影響語言
	POP-10，POP-11，ML

POP-2（也称为POP2，Package for Online Programming：在线编程包），是Robin Popplestone和Rod Burstall在大约1970年于爱丁堡大学开发的编程语言，起源于更早的语言POP-1（Robin Popplestone在1968年开发，最初叫做COWSEL）[1]。它根源于很多来源：LISP和ALGOL 60语言，和来自Peter J. Landin的理论上的想法。它使用增量式编译器，这给与它某些解释型语言的灵活性，包括允许在运行时间定义新函数，和在程序运行时修改函数定义（二者都是动态编译的特征），而没有解释型语言的开销。

影响

POP-2是具有动态绑定和动态（运行时间）确定类型的函数式语言，它的语法是ALGOL风格的，而它的特征受到了Strachey和Landin工作的重大影响。它有一些显著特征，比如在部份应用中具有的一种形式的函数闭包，和受到Landin的J算子启发的一种逃脱机制（jumpout函数），它扮演了与Lisp中的catch/throw类似的角色。

POP-2对ML的设计有着重要的影响，这来自它的记录结构，这里定义了数据构造子和并以字段名字作为选择子，和它的section ... endsection指令，这是提供了初步模块性支持的一种简单名字空间管理机制，ML后来把它替代为local ... in ... end。[2]

参见

POP-11编程语言
Poplog编程环境

引用

(PDF). [2020-05-02]. （原始内容存档 (PDF)于2012-10-03）.
David MacQueen, Robert Harper, John Reppy. (PDF). 2020 [2021-09-11]. （原始内容 (PDF)存档于2022-02-13）. POP-2 was designed by Robin Popplestone and Burstall in the late 1960s [1977; 1968; 1968a], following on Popplestone’s earlier POP-1 language [1968b]. Like Lisp, POP-2 was a functional language with dynamic binding and dynamic (i.e., runtime) typing, but its syntax was in the ALGOL-style, and its features were heavily influenced by the work of Strachey and Landin. It had a number of notable features such as a form of function closure via partial application and an escape mechanism (the jumpout function) inspired by Landin’s J operator that plays a rôle similar to catch/throw in Lisp. The design of ML was also influenced by POP-2’s record structures and by its sections, a simple mechanism for name-space management that provided rudimentary support for modularity.

参考书目

P. M. Burstall, J. S. Collins. (PDF). 1968 [2020-05-02]. （原始内容 (PDF)存档于2012-10-03）.
R. Burstall, J. Collins, R. Popplestone. (PDF). Edinburgh: Edinburgh University Press. 1968 [2021-09-11]. （原始内容 (PDF)存档于2021-09-11）.
R.M. Burstall, R.J. Popplestone. (PDF). Department of Machine Intelligence and Perception, University of Edinburgh. 1968 [2021-09-11]. （原始内容 (PDF)存档于2022-01-02）.

外部链接

The Early Development of POP（页面存档备份，存于）

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[1] (PDF). [2020-05-02]. （原始内容存档 (PDF)于2012-10-03）.

[2] David MacQueen, Robert Harper, John Reppy. (PDF). 2020 [2021-09-11]. （原始内容 (PDF)存档于2022-02-13）. POP-2 was designed by Robin Popplestone and Burstall in the late 1960s [1977; 1968; 1968a], following on Popplestone’s earlier POP-1 language [1968b]. Like Lisp, POP-2 was a functional language with dynamic binding and dynamic (i.e., runtime) typing, but its syntax was in the ALGOL-style, and its features were heavily influenced by the work of Strachey and Landin. It had a number of notable features such as a form of function closure via partial application and an escape mechanism (the jumpout function) inspired by Landin’s J operator that plays a rôle similar to catch/throw in Lisp. The design of ML was also influenced by POP-2’s record structures and by its sections, a simple mechanism for name-space management that provided rudimentary support for modularity.