Re: Globals
On 11/5/2010 10:48 AM, Andrea Crotti wrote:
Andrea Crotti<andrea.crotti.0@gmail.com> writes:
Again on the "Globals" problem.
Since I also have an option parser, to avoid repetition and other
annonying things this approach
namespace GLOBALS
{
int num_landmarks;
int trace_length;
int history_size;
int distribution_size;
Environment *environment;
ostream *out;
is no longer good.
I need a class which stores a map where for example I keep a mapping
like
conf["num_landmarks"] = 3;
and so on.
So how do I make a class for only one object without using the annoying
singleton.
I actually don't care that it could be called more times (which won't).
Should I define the class (as extern??) in the header file and in the
.cpp allocate an object of it?
Ok I thought something like
--8<---------------cut here---------------start------------->8---
class Globals
{
private:
std::map<string, string> config;
public:
Globals();
string operator[](string& idx) { return config[idx]; }
string& operator[](string const& idx) { return config[idx]; }
(returns a reference and takes a reference to const).
};
extern Globals CONFIG;
Why do you really need a class? Why can't you simply do
extern std::map<std::string,std::string> GLOBALS;
?
--8<---------------cut here---------------end--------------->8---
in the header would work, but the operator[] doesn't work as I thought.
How do I pass a reference to a string to it?
I would like to be able to do
CONFIG["variable"] = 10;
for example, but I guess that's not casted to string reference in C++...
V
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