Use correct type of std::map::count
Compiling Ardour commit ec8a4de015 with GCC
6.1.1 (on Fedora 24) gave this build failure:
In file included from /home/sam/ardour/libs/lua/LuaBridge/LuaBridge.h:154:0,
from ../tools/luadevel/devel.cc:16:
/home/sam/ardour/libs/lua/LuaBridge/detail/Namespace.h: In instantiation of ‘luabridge::Namespace::Class<std::map<K, V> > luabridge::Namespace::beginStdMap(const char*) [with K = std::__cxx11::basic_string<char>; V = std::__cxx11::basic_string<char>]’:
../tools/luadevel/devel.cc:89:60: required from here
/home/sam/ardour/libs/lua/LuaBridge/detail/Namespace.h:1666:30: error: no matches converting function ‘count’ to type ‘void (class std::map<std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char>, std::less<std::__cxx11::basic_string<char> >, std::allocator<std::pair<const std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > > >::*)()’
.addFunction ("count", (void (LT::*)())<::count)
^~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/6.1.1/map:61:0,
from /home/sam/ardour/libs/lua/LuaBridge/LuaBridge.h:45,
from ../tools/luadevel/devel.cc:16:
/usr/include/c++/6.1.1/bits/stl_map.h:1131:2: note: candidates are: template<class _Kt> decltype (((const std::map<_Key, _Tp, _Compare, _Alloc>*)this)->std::map<_Key, _Tp, _Compare, _Alloc>::_M_t._M_count_tr(__x)) std::map<_Key, _Tp, _Compare, _Alloc>::count(const _Kt&) const [with _Kt = _Kt; _Key = std::__cxx11::basic_string<char>; _Tp = std::__cxx11::basic_string<char>; _Compare = std::less<std::__cxx11::basic_string<char> >; _Alloc = std::allocator<std::pair<const std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >]
count(const _Kt& __x) const -> decltype(_M_t._M_count_tr(__x))
^~~~~
/usr/include/c++/6.1.1/bits/stl_map.h:1125:7: note: std::map<_Key, _Tp, _Compare, _Alloc>::size_type std::map<_Key, _Tp, _Compare, _Alloc>::count(const key_type&) const [with _Key = std::__cxx11::basic_string<char>; _Tp = std::__cxx11::basic_string<char>; _Compare = std::less<std::__cxx11::basic_string<char> >; _Alloc = std::allocator<std::pair<const std::__cxx11::basic_string<char>, std::__cxx11::basic_string<char> > >; std::map<_Key, _Tp, _Compare, _Alloc>::size_type = long unsigned int; std::map<_Key, _Tp, _Compare, _Alloc>::key_type = std::__cxx11::basic_string<char>]
count(const key_type& __x) const
^~~~~
Casting std::map::count to the correct type instead of a fake void()
type fixes the compile failure.
e37b250d4d