From -6687436931287000313 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: f78e5,fe6310a7fb6a4c8c X-Google-Attributes: gidf78e5,public From: "Tom McKearney" Subject: Re: const int& or int const& Date: 1998/02/06 Message-ID: <6bb9ek$1hb$1@ha2.rdc1.md.home.com>#1/1 X-Deja-AN: 322700230 References: <34D8AD3C.5C38416B@heidelbg.ibm.com> X-Original-Date: Wed, 4 Feb 1998 21:57:58 -0500 X-Mimeole: Produced By Microsoft MimeOLE V4.72.2106.4 Organization: My House X-Auth: PGPMoose V1.1 PGP comp.std.c++ iQBVAwUBNNtaxUy4NqrwXLNJAQH32gIApPVBQ32oaSjGOt8A7pvKIbzHLbioScNB VSAqVi452KxXbuFmsuJXB9cV3wurcEM4H+jDnOQw9aFQrKKHAAtR+Q== =ofsM Newsgroups: comp.std.c++ Originator: austern@isolde.mti.sgi.com Martin Neimeier wrote in message <34D8AD3C.5C38416B@heidelbg.ibm.com>... >What is the difference between the three method-headers ? > >void foo(const in& foo_var); >void foo(int const& foo_var); >void foo(const int const& foo_var); You can get this from the C++ FAQ, but here goes (hope I am thinking clearly)... 1) void foo(const int& foo_var); this is a function that takes a reference to a const int. This means the integer can't be modified. 2) void foo(int const& foo_var); this is also a function that takes a reference to a const int. This means the integer can't be modified. 3) void foo(const int const& foo_var); I am not sure if this is valid. I am too lazy to look it up, but I think it is invalid. The difference between placement of const is easier to define with pointers.. 1) void foo(const int* foo_var) 2) void foo(int const* foo_var) These would take a pointer to a const int. The integer is not modifiable, but the pointer can be modified (i.e. reseated). 3) void foo(int *const foo_var) This takes a const pointer to an integer. The integer can be modified, but the pointer can be. 4) void foo(const int* const foo_var) This takes a const pointer to a const integer. Neither the integer, nor the pointer may be modified. I hope this helps. Tom McKearney --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://reality.sgi.com/austern/std-c++/faq.html ]