Re: Initialising a map

From:

SeanW <sean_woolcock@yahoo.com>

Newsgroups:

comp.lang.c++

Date:

Fri, 27 Jun 2008 07:04:39 -0700 (PDT)

Message-ID:

<4363b6c3-25c1-480a-8e73-ea770891822e@m45g2000hsb.googlegroups.com>

On Jun 27, 9:30 am, Angus <anguscom...@gmail.com> wrote:

On 27 Jun, 14:13, David C=F4me <davidc...@wanadoo.fr> wrote:

On Fri, 27 Jun 2008 15:06:09 +0200, Angus <anguscom...@gmail.com> wrote=

Should I be able to do something like this:

  static const std::map<RequestType, string> RequestMap = {
    { AOpenEx, "AOpenEx" },
    { AClose, "AClose" },
    { ARegister, "ARegister" },
    { AUnregister, "Unregister" } };

RequestType is an enum.

I can't compile it. Or can I not initialise with an array like this?

look at boost::assign and particularly at map_list_of

Unfortunately I cannot use boost here. Maybe it is easier not to use
a map as the data is fairly static. What is the easiest way for me to
create a mapping like this?

How about:

    typedef std::map<RequestType, string> RequestMap;
    RequestMap tmp_map;
    tmp_map[AOpenEx] = "AOpenEx";
    tmp_map[AClose] = "AClose";
    tmp_map[ARegister] = "ARegister";
    tmp_map[AUnregister] = "AUnregister";
    static const RequestMap const_map(tmp_map);

A bit ugly, but it works.

You might also be interested in this proposal for future
C++ initializer lists:

  http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1509.pdf

Sean