Fortran语言:类型未知大小的数组 [英] Fortran: Array of unknown size in type

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问题描述

也许,这是一个非常愚蠢的问题,应该真正做到这一点不同,但是:
是否有可能有类似

Perhaps this is a really stupid question and one should really do this differently, but: Is there a possibility to have something like

type food
 INTEGER :: NBananasLeft(NBananaTypes)
 INTEGER :: NApplesLeft(NAppleTypes)
end type food

在这里NBananaTypes和NAppleTypes不是在编译时知道的?

where NBananaTypes and NAppleTypes is not known at compilation time?

推荐答案

在Fortran语言90-95:

In Fortran 90-95:

type food
 INTEGER,pointer :: NBananasLeft(:)
 INTEGER,pointer :: NApplesLeft(:)
end type food

您必须分配自己使用的阵列分配(VAR%NBananasLeft(NBananaTypes)))

you must allocate the arrays yourself using allocate(var%NBananasLeft(NBananaTypes))).

在2003 Fortran语言:

In Fortran 2003:

type food
 INTEGER,allocatable :: NBananasLeft(:)
 INTEGER,allocatable :: NApplesLeft(:)
end type food

您还必须分配自己使用分配阵列(VAR%NBananasLeft(NBananaTypes))),但你避免内存泄漏的可能性。

you must also allocate the arrays yourself using allocate(var%NBananasLeft(NBananaTypes))), but you avoid the possibility of memory leaks.

在2003 Fortran语言通过参数化的数据类型(只有少数编译器支持):

In Fortran 2003 by parametrized data types (only a few compilers support that):

type food(NBananaTypes,NAppleTypes)
 integer,len :: NBananaTypes,NAppleTypes
 INTEGER :: NBananasLeft(NBananaTypes)
 INTEGER :: NApplesLeft(NAppleTypes)
end type food

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