container traits information
Hi, Is there any boost utility which statically determines if a template parameter is const or not? ( MPL library ?) I need to design something like boost::sub_range, but little different (It will iterate over arbitrary sequence stored in a vector form, rather than a sequence stored in pair form). like, template<typename C> class index_range{ private: C* container_; std::vector<size_type> index_; }; container & index will be passed through constructor. Now if C is const container it will return const_reference etc. Thus what is needed is something like, container_traits<const std::vector>::iterator is a const_iterator while container_traits<std::vector>::iterator is a iterator etc. Thank you for any kind of help. -- Abir Basak, Member IEEE Software Engineer, Read Ink Technologies B. Tech, IIT Kharagpur email: abir@abirbasak.com homepage: www.abirbasak.com
abir basak wrote:
Hi, Is there any boost utility which statically determines if a template parameter is const or not? ( MPL library ?)
I need to design something like boost::sub_range, but little different (It will iterate over arbitrary sequence stored in a vector form, rather than a sequence stored in pair form). like, template<typename C> class index_range{ private: C* container_; std::vector<size_type> index_; }; container & index will be passed through constructor. Now if C is const container it will return const_reference etc.
Thus what is needed is something like, container_traits<const std::vector>::iterator is a const_iterator while container_traits<std::vector>::iterator is a iterator etc.
What is wrong with boost::range_iterator<C>::type ? -Thorsten
Thorsten Ottosen wrote:
abir basak wrote:
Hi, Is there any boost utility which statically determines if a template parameter is const or not? ( MPL library ?)
I need to design something like boost::sub_range, but little different (It will iterate over arbitrary sequence stored in a vector form, rather than a sequence stored in pair form). like, template<typename C> class index_range{ private: C* container_; std::vector<size_type> index_; }; container & index will be passed through constructor. Now if C is const container it will return const_reference etc.
Thus what is needed is something like, container_traits<const std::vector>::iterator is a const_iterator while container_traits<std::vector>::iterator is a iterator etc.
What is wrong with boost::range_iterator<C>::type ?
Nothing wrong! This is exactly what I was looking for. Thanks for pointing it out! amazing library! abir
-Thorsten
-- Abir Basak, Member IEEE Software Engineer, Read Ink Technologies B. Tech, IIT Kharagpur email: abir@abirbasak.com homepage: www.abirbasak.com
abir basak wrote:
Thorsten Ottosen wrote:
abir basak wrote:
Hi, Is there any boost utility which statically determines if a template parameter is const or not? ( MPL library ?)
I need to design something like boost::sub_range, but little different (It will iterate over arbitrary sequence stored in a vector form, rather than a sequence stored in pair form). like, template<typename C> class index_range{ private: C* container_; std::vector<size_type> index_; }; container & index will be passed through constructor. Now if C is const container it will return const_reference etc.
Thus what is needed is something like, container_traits<const std::vector>::iterator is a const_iterator while container_traits<std::vector>::iterator is a iterator etc. What is wrong with boost::range_iterator<C>::type ?
Nothing wrong! This is exactly what I was looking for. Thanks for pointing it out! amazing library!
Though I'm not sure about what you want, 'boost::permutation_iterator' can assist? http://www.boost.org/libs/iterator/doc/permutation_iterator.html -- Shunsuke Sogame
participants (3)
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abir basak -
shunsuke -
Thorsten Ottosen