"Alexander Nasonov" <alnsn-mycop@yandex.ru> wrote
Thorsten Ottosen wrote:
its not global. And you have to include the specific assign/stl.hpp header.
My problem with assignment lib is shown in following. in a nutshell I might want to use assign , but not +=, from assignment lib. Currently not possible. Personally I dont like use of += function for init anyways. Nevertheless for maps etc and matrices etc it might be useful. OTOH Adding brackets to each initialiser for assign is a bit ugly... but appreciate not much you can do about it. regards Andy Little -------------- #include <iostream> #include <vector> // stream output for vector of t #include "test.hpp" #include "pqs/pqs.hpp" // if += used for another purpose cant use assign lib // following cant both be true #define USE_ARITH_PLUS_EQ 1 #define USE_ASSIGN_LIB 0 #if USE_ASSIGN_LIB #include "boost/assign.hpp" using namespace boost::assignment; // bring asignment libs 'operator+=()' into scope #endif #if USE_ARITH_PLUS_EQ // Dont want assignment lib += semantics, // rather want to add a value to every element in a vector template <typename T> std::vector<T>& operator +=(std::vector<T>& vect, T t) { std::vector<T>::iterator iter= vect.begin(); while(iter != vect.end()){ *iter += t; ++iter; } return vect; } #endif using namespace pqs; int main() { std::vector<pqs::q_length::mm> v; // ok cant use += assignment semantics here // but maybe would like to use assign function #if USE_ASSIGN_LIB assign( v ) (pqs::q_length::mm(1)), (pqs::q_length::mm(2)), (pqs::q_length::mm(3)), (pqs::q_length::mm(4)); #else v.push_back(pqs::q_length::mm(1)); v.push_back(pqs::q_length::mm(2)); v.push_back(pqs::q_length::mm(3)); v.push_back(pqs::q_length::mm(4)); #endif std::cout << v <<'\n'; #if USE_ARITH_PLUS_EQ // cant do this and use assignment lib v += q_length::mm(1); #endif std::cout << v <<'\n'; }