cppcms-users

[Cppcms-users] Iterate through a cppcms::json::object?

[Dietrich M. <die...@gm...>]

Hey,
I would like to see an example for iterating through a given json object
variable.
I tried the following:

cppcms::json::object settings;

cppcms::json::object::iterator iter;

for(settings.begin(); iter < settings.end(); ++iter){
}

But as you might guess it does not even compile.

...36|error: no match for ‘operator<’ in ‘iter < settings.std::map<_Key,
_Tp, _Compare, _Alloc>::end [with _Key = cppcms::string_key, _Tp =
cppcms::json::value, _Compare = std::less<cppcms::string_key>, _Alloc =
std::allocator<std::pair<const cppcms::string_key, cppcms::json::value> >,
std::map<_Key, _Tp, _Compare, _Alloc>::iterator =
std::_Rb_tree_iterator<std::pair<const cppcms::string_key,
cppcms::json::value> >]()’|

Re: [Cppcms-users] Iterate through a cppcms::json::object?

[Dietrich M. <die...@gm...>]

Hey,
I would like to see an example for iterating through a given json object
variable.
I tried the following:

cppcms::json::object settings;

cppcms::json::object::iterator iter;

for(settings.begin(); iter < settings.end(); ++iter){
}

But as you might guess it does not even compile.

...36|error: no match for ‘operator<’ in ‘iter < settings.std::map<_Key,
_Tp, _Compare, _Alloc>::end [with _Key = cppcms::string_key, _Tp =
cppcms::json::value, _Compare = std::less<cppcms::string_key>, _Alloc =
std::allocator<std::pair<const cppcms::string_key, cppcms::json::value> >,
std::map<_Key, _Tp, _Compare, _Alloc>::iterator =
std::_Rb_tree_iterator<std::
pair<const cppcms::string_key, cppcms::json::value> >]()’|

Re: [Cppcms-users] Iterate through a cppcms::json::object?

[<ele...@ex...>]

http://www.cplusplus.com/reference/stl/map/

Petr

Re: [Cppcms-users] Iterate through a cppcms::json::object?

[<ele...@ex...>]

> Hey,
> I would like to see an example for iterating through a given json object
> variable.
> I tried the following:

Ok here it is again

http://www.cplusplus.com/reference/stl/map/

std::map defines no operator< (less than operator). You have to use the
"not equals" operator to check for bounds. This is because
std::map::iterator is not a random access iterator, and therefore cannot
provide a less than operator.

Petr

Re: [Cppcms-users] Iterate through a cppcms::json::object?

[Dietrich M. <die...@gm...>]

On Thu, Sep 20, 2012 at 1:40 PM, <ele...@ex...> wrote:

> > Hey,
> > I would like to see an example for iterating through a given json object
> > variable.
> > I tried the following:
>
> Ok here it is again
>
> http://www.cplusplus.com/reference/stl/map/
>
> std::map defines no operator< (less than operator). You have to use the
> "not equals" operator to check for bounds. This is because
> std::map::iterator is not a random access iterator, and therefore cannot
> provide a less than operator.
>
> Petr
>
>
>
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Thanks, but I figured it out by myself yesterday.