<div dir="ltr">Hi,<br><br>I have the following piece of code:<br><br> std::vector<std::string> list1;<br> std::vector<std::string> list2; <br> push_back(list2, list1<br> | transformed([](const auto& w) { return w; })<br> | sliced(0, 1));<br><br>This compiles fine with CLang, but with GCC I get the error:<br><br> /usr/include/boost/optional/optional.hpp:546:64: error: use of deleted function 'main(int, const char**)::<lambda(const auto:1&)>& main(int, const char**)::<lambda(const auto:1&)>::operator=(const main(int, const char**)::<lambda(const auto:1&)>&)'<br> void assign_value ( rval_reference_type val ) { get_impl() = static_cast<rval_reference_type>(val); }<br><br> ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br> main.cpp:46:19: note: a lambda closure type has a deleted copy assignment operator<br> | transformed([](const auto& w) { return w; })<br><br><br>When I replace the lambda by a regular function, the code compiles; when I don't use 'sliced' (but pipe it to e.g. 'transformed' instead), the code also compiles.<br><br>Is there a way to make this code compile with a lambda?<br><br>thanks!<br>Remko<br><br>PS: I'm using GCC 6.2.0 with Boost 1.61.<br></div>