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Environment: MinGW64 13.2.1 on Fedora (can be generated from the Dockerfile here)
#include <lager/reader.hpp> #include <lager/state.hpp> #include <optional> struct Foo { int a; const int &getA() const { return a; } int getAVal() const { return a; } }; const int &getFooA(const Foo &f) { return f.a; } int main() { auto s = lager::make_state(Foo{1}); // lager::reader<int> sa0 = s[&Foo::a]; // lager::reader<int> sa1 = s.map(&Foo::getA); // lager::reader<int> sa2 = s.map(&Foo::getAVal); // lager::reader<int> sa3 = s.map(&getFooA); }
The lines with sa0 and sa3 compile fine.
sa0
sa3
If I uncomment sa1, I get:
sa1
# x86_64-w64-mingw32-g++ -I/opt/libkazv-deps/include/ test.cpp In file included from /opt/libkazv-deps/include/lager/with.hpp:22, from /opt/libkazv-deps/include/lager/reader.hpp:20, from test.cpp:1: /opt/libkazv-deps/include/zug/transducer/map.hpp: In instantiation of 'zug::map_t<const int& (Foo::*)() const>::operator()<const zug::last_t&>(const zug::last_t&) const::<lambda(auto:64&&, auto:65&& ...)> mutable [with auto:64 = zug::meta::bottom; auto:65 = {Foo}]': /opt/libkazv-deps/include/zug/meta.hpp:65:14: required from 'struct zug::result_of<zug::composed<zug::map_t<const int& (Foo::*)() const> >, Foo>' /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:74:7: required from 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:151:27: required from 'auto lager::detail::make_xform_reader_node(Xform&&, std::tuple<std::shared_ptr<Parents>...>) [with Xform = zug::composed<zug::map_t<const int& (Foo::*)() const> >; Parents = {state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:290:38: required from 'auto lager::detail::with_xform_expr<Xform, Nodes>::make_reader_node_() && [with Xform = zug::composed<zug::map_t<const int& (Foo::*)() const> >; Nodes = {lager::detail::state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:224:75: required from 'auto lager::detail::with_expr_base<Deriv>::make_node_() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:207:45: required from 'auto lager::detail::with_expr_base<Deriv>::make() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:182:23: required by substitution of 'template<class T, class U, typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> > lager::detail::with_expr_base<lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> > >::operator lager::reader<T>() && [with T = int; U = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >; typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> = <missing>]' test.cpp:20:44: required from here /opt/libkazv-deps/include/zug/transducer/map.hpp:23:24: error: no match for call to '(const zug::last_t) (zug::meta::bottom, const int& (Foo::)() const)' 23 | return step(ZUG_FWD(s), compat::invoke(mapping, ZUG_FWD(is)...)); | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /opt/libkazv-deps/include/zug/meta.hpp:12, from /opt/libkazv-deps/include/lager/detail/lens_nodes.hpp:19, from /opt/libkazv-deps/include/lager/with.hpp:15: /opt/libkazv-deps/include/zug/reducing/last.hpp:19:20: note: candidate: 'template<class StateT, class ... InputTs> decltype(auto) zug::last_t::operator()(StateT&&, InputTs&& ...) const' 19 | decltype(auto) operator()(StateT&&, InputTs&&... ins) const | ^~~~~~~~ /opt/libkazv-deps/include/zug/reducing/last.hpp:19:20: note: template argument deduction/substitution failed: /opt/libkazv-deps/include/zug/transducer/map.hpp:23:24: note: member function type 'const int& (Foo::)() const' is not a valid template argument 23 | return step(ZUG_FWD(s), compat::invoke(mapping, ZUG_FWD(is)...)); | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /opt/libkazv-deps/include/lager/with.hpp:17: /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp: In instantiation of 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>': /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:151:27: required from 'auto lager::detail::make_xform_reader_node(Xform&&, std::tuple<std::shared_ptr<Parents>...>) [with Xform = zug::composed<zug::map_t<const int& (Foo::*)() const> >; Parents = {state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:290:38: required from 'auto lager::detail::with_xform_expr<Xform, Nodes>::make_reader_node_() && [with Xform = zug::composed<zug::map_t<const int& (Foo::*)() const> >; Nodes = {lager::detail::state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:224:75: required from 'auto lager::detail::with_expr_base<Deriv>::make_node_() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:207:45: required from 'auto lager::detail::with_expr_base<Deriv>::make() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:182:23: required by substitution of 'template<class T, class U, typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> > lager::detail::with_expr_base<lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> > >::operator lager::reader<T>() && [with T = int; U = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >; typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> = <missing>]' test.cpp:20:44: required from here /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:98:10: error: 'void lager::detail::xform_reader_node<Xform, zug::meta::pack<Ts2 ...>, Base>::recompute() [with Xform = zug::composed<zug::map_t<const int& (Foo::*)() const> >; Parents = {lager::detail::state_node<Foo, lager::transactional_tag>}; Base = lager::detail::reader_node]' marked 'final', but is not virtual 98 | void recompute() final | ^~~~~~~~~ In file included from /opt/libkazv-deps/include/lager/reader.hpp:19: /opt/libkazv-deps/include/lager/watch.hpp: In instantiation of 'class lager::watchable_base<lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node> >': /opt/libkazv-deps/include/lager/reader.hpp:83:7: required from 'class lager::reader_base<lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node> >' /opt/libkazv-deps/include/lager/with.hpp:210:29: required from 'auto lager::detail::with_expr_base<Deriv>::make() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:182:23: required by substitution of 'template<class T, class U, typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> > lager::detail::with_expr_base<lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> > >::operator lager::reader<T>() && [with T = int; U = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >; typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> = <missing>]' test.cpp:20:44: required from here /opt/libkazv-deps/include/lager/watch.hpp:24:7: error: no type named 'signal_type' in 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' 24 | class watchable_base : private NodeT::signal_type::forwarder_type | ^~~~~~~~~~~~~~ /opt/libkazv-deps/include/lager/watch.hpp:28:11: error: no type named 'signal_type' in 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' 28 | using base_t = typename NodeT::signal_type::forwarder_type; | ^~~~~~ /opt/libkazv-deps/include/lager/watch.hpp:32:31: error: no type named 'signal_type' in 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' 32 | std::vector<connection_t> conns_; | ^~~~~~ test.cpp: In function 'int main()': test.cpp:20:33: error: conversion from 'lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >' to non-scalar type 'lager::reader<int>' requested 20 | lager::reader<int> sa1 = s.map(&Foo::getA); | ~~~~~^~~~~~~~~~~~ In file included from /opt/libkazv-deps/include/lager/reader.hpp:16: /opt/libkazv-deps/include/lager/detail/nodes.hpp: In instantiation of 'std::shared_ptr<_Tp> lager::detail::link_to_parents(std::shared_ptr<_Tp>) [with Node = xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<state_node<Foo, lager::transactional_tag> >, reader_node>]': /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:151:27: required from 'auto lager::detail::make_xform_reader_node(Xform&&, std::tuple<std::shared_ptr<Parents>...>) [with Xform = zug::composed<zug::map_t<const int& (Foo::*)() const> >; Parents = {state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:290:38: required from 'auto lager::detail::with_xform_expr<Xform, Nodes>::make_reader_node_() && [with Xform = zug::composed<zug::map_t<const int& (Foo::*)() const> >; Nodes = {lager::detail::state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:224:75: required from 'auto lager::detail::with_expr_base<Deriv>::make_node_() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:207:45: required from 'auto lager::detail::with_expr_base<Deriv>::make() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:182:23: required by substitution of 'template<class T, class U, typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> > lager::detail::with_expr_base<lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> > >::operator lager::reader<T>() && [with T = int; U = lager::detail::with_xform_expr<zug::composed<zug::map_t<const int& (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >; typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> = <missing>]' test.cpp:20:44: required from here /opt/libkazv-deps/include/lager/detail/nodes.hpp:320:69: error: 'using std::__shared_ptr_access<lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>, __gnu_cxx::_S_atomic, false, false>::element_type = class lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' {aka 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<const int& (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>'} has no member named 'parents' 320 | std::apply([&](auto&&... ps) { noop((ps->link(n), 0)...); }, n->parents()); | ~~~^~~~~~~
If I uncomment sa2, I get:
sa2
# x86_64-w64-mingw32-g++ -I/opt/libkazv-deps/include/ test.cpp In file included from /opt/libkazv-deps/include/lager/with.hpp:22, from /opt/libkazv-deps/include/lager/reader.hpp:20, from test.cpp:1: /opt/libkazv-deps/include/zug/transducer/map.hpp: In instantiation of 'zug::map_t<int (Foo::*)() const>::operator()<const zug::last_t&>(const zug::last_t&) const::<lambda(auto:64&&, auto:65&& ...)> mutable [with auto:64 = zug::meta::bottom; auto:65 = {Foo}]': /opt/libkazv-deps/include/zug/meta.hpp:65:14: required from 'struct zug::result_of<zug::composed<zug::map_t<int (Foo::*)() const> >, Foo>' /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:74:7: required from 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:151:27: required from 'auto lager::detail::make_xform_reader_node(Xform&&, std::tuple<std::shared_ptr<Parents>...>) [with Xform = zug::composed<zug::map_t<int (Foo::*)() const> >; Parents = {state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:290:38: required from 'auto lager::detail::with_xform_expr<Xform, Nodes>::make_reader_node_() && [with Xform = zug::composed<zug::map_t<int (Foo::*)() const> >; Nodes = {lager::detail::state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:224:75: required from 'auto lager::detail::with_expr_base<Deriv>::make_node_() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:207:45: required from 'auto lager::detail::with_expr_base<Deriv>::make() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:182:23: required by substitution of 'template<class T, class U, typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> > lager::detail::with_expr_base<lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> > >::operator lager::reader<T>() && [with T = int; U = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >; typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> = <missing>]' test.cpp:21:47: required from here /opt/libkazv-deps/include/zug/transducer/map.hpp:23:24: error: no match for call to '(const zug::last_t) (zug::meta::bottom, int (Foo::)() const)' 23 | return step(ZUG_FWD(s), compat::invoke(mapping, ZUG_FWD(is)...)); | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /opt/libkazv-deps/include/zug/meta.hpp:12, from /opt/libkazv-deps/include/lager/detail/lens_nodes.hpp:19, from /opt/libkazv-deps/include/lager/with.hpp:15: /opt/libkazv-deps/include/zug/reducing/last.hpp:19:20: note: candidate: 'template<class StateT, class ... InputTs> decltype(auto) zug::last_t::operator()(StateT&&, InputTs&& ...) const' 19 | decltype(auto) operator()(StateT&&, InputTs&&... ins) const | ^~~~~~~~ /opt/libkazv-deps/include/zug/reducing/last.hpp:19:20: note: template argument deduction/substitution failed: /opt/libkazv-deps/include/zug/transducer/map.hpp:23:24: note: member function type 'int (Foo::)() const' is not a valid template argument 23 | return step(ZUG_FWD(s), compat::invoke(mapping, ZUG_FWD(is)...)); | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /opt/libkazv-deps/include/lager/with.hpp:17: /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp: In instantiation of 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>': /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:151:27: required from 'auto lager::detail::make_xform_reader_node(Xform&&, std::tuple<std::shared_ptr<Parents>...>) [with Xform = zug::composed<zug::map_t<int (Foo::*)() const> >; Parents = {state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:290:38: required from 'auto lager::detail::with_xform_expr<Xform, Nodes>::make_reader_node_() && [with Xform = zug::composed<zug::map_t<int (Foo::*)() const> >; Nodes = {lager::detail::state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:224:75: required from 'auto lager::detail::with_expr_base<Deriv>::make_node_() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:207:45: required from 'auto lager::detail::with_expr_base<Deriv>::make() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:182:23: required by substitution of 'template<class T, class U, typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> > lager::detail::with_expr_base<lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> > >::operator lager::reader<T>() && [with T = int; U = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >; typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> = <missing>]' test.cpp:21:47: required from here /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:98:10: error: 'void lager::detail::xform_reader_node<Xform, zug::meta::pack<Ts2 ...>, Base>::recompute() [with Xform = zug::composed<zug::map_t<int (Foo::*)() const> >; Parents = {lager::detail::state_node<Foo, lager::transactional_tag>}; Base = lager::detail::reader_node]' marked 'final', but is not virtual 98 | void recompute() final | ^~~~~~~~~ In file included from /opt/libkazv-deps/include/lager/reader.hpp:19: /opt/libkazv-deps/include/lager/watch.hpp: In instantiation of 'class lager::watchable_base<lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node> >': /opt/libkazv-deps/include/lager/reader.hpp:83:7: required from 'class lager::reader_base<lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node> >' /opt/libkazv-deps/include/lager/with.hpp:210:29: required from 'auto lager::detail::with_expr_base<Deriv>::make() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:182:23: required by substitution of 'template<class T, class U, typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> > lager::detail::with_expr_base<lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> > >::operator lager::reader<T>() && [with T = int; U = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >; typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> = <missing>]' test.cpp:21:47: required from here /opt/libkazv-deps/include/lager/watch.hpp:24:7: error: no type named 'signal_type' in 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' 24 | class watchable_base : private NodeT::signal_type::forwarder_type | ^~~~~~~~~~~~~~ /opt/libkazv-deps/include/lager/watch.hpp:28:11: error: no type named 'signal_type' in 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' 28 | using base_t = typename NodeT::signal_type::forwarder_type; | ^~~~~~ /opt/libkazv-deps/include/lager/watch.hpp:32:31: error: no type named 'signal_type' in 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' 32 | std::vector<connection_t> conns_; | ^~~~~~ test.cpp: In function 'int main()': test.cpp:21:33: error: conversion from 'lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >' to non-scalar type 'lager::reader<int>' requested 21 | lager::reader<int> sa2 = s.map(&Foo::getAVal); | ~~~~~^~~~~~~~~~~~~~~ In file included from /opt/libkazv-deps/include/lager/reader.hpp:16: /opt/libkazv-deps/include/lager/detail/nodes.hpp: In instantiation of 'std::shared_ptr<_Tp> lager::detail::link_to_parents(std::shared_ptr<_Tp>) [with Node = xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<state_node<Foo, lager::transactional_tag> >, reader_node>]': /opt/libkazv-deps/include/lager/detail/xform_nodes.hpp:151:27: required from 'auto lager::detail::make_xform_reader_node(Xform&&, std::tuple<std::shared_ptr<Parents>...>) [with Xform = zug::composed<zug::map_t<int (Foo::*)() const> >; Parents = {state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:290:38: required from 'auto lager::detail::with_xform_expr<Xform, Nodes>::make_reader_node_() && [with Xform = zug::composed<zug::map_t<int (Foo::*)() const> >; Nodes = {lager::detail::state_node<Foo, lager::transactional_tag>}]' /opt/libkazv-deps/include/lager/with.hpp:224:75: required from 'auto lager::detail::with_expr_base<Deriv>::make_node_() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:207:45: required from 'auto lager::detail::with_expr_base<Deriv>::make() && [with Deriv = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >]' /opt/libkazv-deps/include/lager/with.hpp:182:23: required by substitution of 'template<class T, class U, typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> > lager::detail::with_expr_base<lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> > >::operator lager::reader<T>() && [with T = int; U = lager::detail::with_xform_expr<zug::composed<zug::map_t<int (Foo::*)() const> >, lager::detail::state_node<Foo, lager::transactional_tag> >; typename std::enable_if<is_same_v<typename decltype (declval<U>().make())::value_type, T>, int>::type <anonymous> = <missing>]' test.cpp:21:47: required from here /opt/libkazv-deps/include/lager/detail/nodes.hpp:320:69: error: 'using std::__shared_ptr_access<lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>, __gnu_cxx::_S_atomic, false, false>::element_type = class lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>' {aka 'class lager::detail::xform_reader_node<zug::composed<zug::map_t<int (Foo::*)() const> >, zug::meta::pack<lager::detail::state_node<Foo, lager::transactional_tag> >, lager::detail::reader_node>'} has no member named 'parents' 320 | std::apply([&](auto&&... ps) { noop((ps->link(n), 0)...); }, n->parents()); | ~~~^~~~~~~
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sa0andsa3compile fine.If I uncomment
sa1, I get:If I uncomment
sa2, I get:The text was updated successfully, but these errors were encountered: