emplace_back sur un vector

Bonjour,

J'essaye de faire un emplace_back sur un vector.

Code:

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static std::vector<portal<net::enable_client>*> container;

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Le constructeur:

Code:

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portal(const std::tuple<d, d, idt, img_id_t, map_item_type_t, idt, idt, force_t, force_t, idt>& t) :

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Le emplace_back:

Code:

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container.emplace_back(tools::explode<d, d, idt, img_id_t, map_item_type_t, idt, idt, force_t, force_t, idt>(l, fs2::basic_separator));

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La fonction explode fonctionne très bien, si jamais cela peut aider:

Code:

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1 2 3 4 5 6

template <class... Types> std::tuple<Types...> explode(const std::string& str, const char delimiter) { std::istringstream is(str); return variadic::explode_impl<Types...>::call(is, delimiter); }

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J'obtient du compilo une ligne rouge... :(

Citation:

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/media/data/dev/projects/baws/baws/tools/secure_strings.h|29|warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]|
/media/data/dev/projects/Servers/handler/inl/player_channel.h||In member function ‘net::handlers::player_channel<Protocol, false>::ret net::handlers::player_channel<Protocol, false>::use_portal(net::session<Protocol>*, net::iopacket::reader&)’:|
/media/data/dev/projects/Servers/handler/inl/player_channel.h|108|error: ‘class net::packets::player_channel<false>’ has no member named ‘warp’|
/usr/include/c++/4.8/bits/alloc_traits.h|254| required from ‘static typename std::enable_if<std::allocator_traits<_Alloc>::__construct_helper<_Tp, _Args>::value, void>::type std::allocator_traits<_Alloc>::_S_construct(_Alloc&, _Tp*, _Args&& ...) [with _Tp = gamedata::portal<true>*; _Args = {std::tuple<double, double, long unsigned int, long unsigned int, short unsigned int, long unsigned int, long unsigned int, double, double, long unsigned int>}; _Alloc = std::allocator<gamedata::portal<true>*>; typename std::enable_if<std::allocator_traits<_Alloc>::__construct_helper<_Tp, _Args>::value, void>::type = void]’|
/usr/include/c++/4.8/bits/alloc_traits.h|393| required from ‘static decltype (_S_construct(__a, __p, (forward<_Args>)(std::allocator_traits::construct::__args)...)) std::allocator_traits<_Alloc>::construct(_Alloc&, _Tp*, _Args&& ...) [with _Tp = gamedata::portal<true>*; _Args = {std::tuple<double, double, long unsigned int, long unsigned int, short unsigned int, long unsigned int, long unsigned int, double, double, long unsigned int>}; _Alloc = std::allocator<gamedata::portal<true>*>; decltype (_S_construct(__a, __p, (forward<_Args>)(std::allocator_traits::construct::__args)...)) = <type error>]’|
/usr/include/c++/4.8/bits/vector.tcc|97| required from ‘void std::vector<_Tp, _Alloc>::emplace_back(_Args&& ...) [with _Args = {std::tuple<double, double, long unsigned int, long unsigned int, short unsigned int, long unsigned int, long unsigned int, double, double, long unsigned int>}; _Tp = gamedata::portal<true>*; _Alloc = std::allocator<gamedata::portal<true>*>]’|
/media/data/dev/projects/gamedata/portal.h|30| required from here|
/usr/include/c++/4.8/ext/new_allocator.h|120|error: cannot convert ‘std::tuple<double, double, long unsigned int, long unsigned int, short unsigned int, long unsigned int, long unsigned int, double, double, long unsigned int>’ to ‘gamedata::portal<true>*’ in initialization|
||=== Build finished: 6 errors, 1 warnings ===|

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Comment fait-on pour faire un joli emplace_back ?

Merci

nico

Bonjour,

Tu as déclaré un vecteur de pointeurs, donc emplace_back s'attend à ce que tu lui fournisse un pointeur (sur portal<net::enable_client>).
Peut-être essayer avec un new : truc.emplace_back(new portal(tools::explode<muche, ...>(machin, ...)));

En effet cette solution compile.
Mais est ce que j'ai bien les avantages de emplace_back, c'est à dire la construction de l'objet sans la copie/move ?!

Oui tu as bien les avantages de la move semantique... sur un pointeur...

D'accord, merci :)

Je souligne encore:

Citation:

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Envoyé par Ehonn

sur un pointeur...

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