More comments : My compiler is vs2010 : for the bullet 2) and 3) I set up this code :
#include <vector> #include <boost/range/algorithm.hpp> #include <boost/range/algorithm_ext.hpp> #include <boost/range/adaptors.hpp> #include <boost/range/adaptor/strided.hpp> int main() { int ar[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; std::vector<int> v(ar, ar+10); ... }
1) Put "using namespace boost::adaptors" brings havoc. Even with an empty main, just write :
#include <boost/range/adaptors.hpp> using namespace boost::adaptors; and then the compiler emits some strange compilation error : "program files\boost\boost\range\iterator.hpp(63): error C2039: 'type' : is not a member of 'boost::mpl::eval_if_c<C,F1,F2>'"
2) Stride adaptor. I tried :
std::vector<int> v2; boost::push_back(v2, v | boost::adaptors::sliced(0, 5) | boost::adaptors::strided(2) );
I expected that my initial set {1, 2, 3, 4, 5, 6, 7, 8, 9, 10} get sliced to {1, 2, 3, 4, 5} and then strided to {1, 3, 5}. But I actually got an MSVC assert : "Expression : vector iterator not dereferencable" 3) Transform adaptor. Isn't there a way to deduce the return type instead of relying on the typedef return_type ? My first impulse was to tried a lambda:
std::vector<int> v3; push_back(v3, v | transformed([](int i){ return i * 10;} ); But it failed because of the lack of return_type typedef inside the lambda. And actually, even without fancy lambdas, it means that a simple free function will fail too.
Should I file some ticket about this three points ? Regards. 2010/4/18 Thomas Petit <thomas.petit33@gmail.com>
Wait ! Did you just wrote that RangeEx is now at last in the trunk and ready for 1.43 ? That's freaking great !
Two comments : 1) Maybe a small oversight* *in boost/range/adaptors.hpp : all adaptors are included except the strided one. 2) Is there somewhere in RangeEx some shortcuts to construct a standard container directly from a range ? Something along the line of :
namespace boost { template <typename Range> std::vector<typename Range::value_type> make_vector(Range& rng) { return std::vector<typename Range::value_type>(boost::begin(rng), boost::end(rng)); } }
int main() { std::vector<int> v = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}; std::vector<int> v2 = boost::make_vector(v | boost::adaptors::strided(2)); }
Regards.
2010/4/17 Neil Groves <neil@grovescomputing.com>
On Fri, Apr 16, 2010 at 9:52 PM, Thomas Petit <thomas.petit33@gmail.com
wrote:
As the title said : Where is the current version ? :)
It is on the trunk. All you need to do is checkout the trunk from subversion. Boost.Range has all the RangeEx functionality merged in. I am targeting a release in 1.43
It seems to have vanished from the vault !? I can't find any trace here anymore :
http://www.boostpro.com/vault/index.php?&direction=0&order=&directory=Algorithms
Yes it has. I remove it to avoid anyone getting the older version before
the improvements due to review feedback.
Regards, Neil Groves _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost