Re: fortran array and std::vector<T>

From:
Kai-Uwe Bux <jkherciueh@gmx.net>
Newsgroups:
comp.lang.c++
Date:
Fri, 14 Sep 2007 11:47:41 -0700
Message-ID:
<fcel14$bji$2@murdoch.acc.Virginia.EDU>
sebastian sauer wrote:

hi,

1st i read josuttis' STL book. then i knew std::vector<T> is de-facto
guaranteed to be contiguous and this will be in the nxt revision of the
standard. all good. all fine.


Your information is outdated: std::vector<T> already is required to be
contiguous (since 2003).

[23.2.4/1]

  ... The elements of a vector are stored contiguously, meaning that if v is
  a vector<T, Allocator> where T is some type other than bool, then it obeys
  the identity &v[n] == &v[0] + n for all 0 <= n < v.size().

[snip]

my case: a C++ std::vector<T> that is also accessed by a fortran
subroutine as an array.

my question: how shall i do it? what is morale? what is legal? and what is
practical?

void g()
 {
   std::vector<Foo> v;
   ...
   f(v.begin(), v.size()); // this is what i cannot do i figure


right: std::vector<Foo>::iterator is not necessarily Foo*.

   f(&v[0], v.size()); // this is the yuk-dirty way i came up with


this is fine and blessed by the standard unless Foo is bool.

 }


[snip]

Best

Kai-Uwe Bux

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