Re: initialization sequence in header file

Victor Bazarov <v.bazarov@comcast.invalid>
Fri, 06 Apr 2012 16:33:42 -0400
On 4/6/2012 4:01 PM, zl2k wrote:

I have a header file like this:


     static std::set<std::string> CreateSet() {
         std::set<std::string> string_set;
         return string_set;
static std::set<std::string> MY_STRING_SET(SET_CREATOR::CreateSet());

This defines a global variable (that's the intent, yes?) but the
definition is in the header, which means each module that includes that
header will have its own 'MY_STRING_SET' symbol, and they are *not*
related to each other at all.

     static std::map<std::string, std::string> CreateMap() {
         std::map<std::string, std::string> string_map;
         std::cout<<*MY_STRING_SET.cbegin()<<std::endl; // segmentation
error here
         return string_map;
static std::map<std::string, std::string>

My question is: how may I initialize MY_STRING_SET properly so that it
can be used by other struct in the same header file? Thanks for help.

Header files are not compiled. They are text, parts of translation
units. You shouldn't ever *define* variables in headers. What is it
you're trying to do? What you're probably running into is "static
object initialization fiasco", where you're trying to use the static
object (the set in your case) before it has been properly initialized.

A way to avoid that is to make sure the objects are initialized in
proper sequence by calling those function one after the other in another
initializer. But first sort out the "static" issue and the fact that
they are *defined* in a header.

If you're trying to create a singleton (or two singletons with the
second one aware of the first), there are code patterns for that. Try
googling "singleton C++".

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