在fortran中获得免费单位号码 [英] getting free unit number in fortran

问题描述

我需要开发一个库来打开一个文件并解析这些内容。
由于fortran IO风格，单位编号必须由我决定，但我无法知道客户端代码中打开了哪些其他单位。是否有像这样的标准函数？give_me_any_unit_number_that_is_free（）？

I need to develop a library that opens a file and parses the stuff. The unit number, due to fortran IO style, must be decided by me, but I can't know what other units are open in the client code. Is there a standard function like give_me_any_unit_number_that_is_free() ?

推荐答案

2008年，有一个newunit子句打开你可以使用

In fortran 2008, there's a newunit clause to open that you can use

   integer :: myunit

   ..
   open(newunit=myunit,file='file.dat')
   ...
   close(myunit)

但这足够新，并不是所有的编译器都支持它。如果你还没有，你可以嘲笑自己;在 fortran wiki 上有一个很好的例子。

but that's new enough that not all compilers support it yet. If yours doesn't yet, you can mock one up yourself; there's a good example on the fortran wiki.

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