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Implement variadic initializer list for config class

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This commit is contained in:
Celtic Minstrel 2017-05-21 14:54:54 -04:00
parent 5138696292
commit 3b276ff39a
1 changed files with 59 additions and 0 deletions
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59
src/config.hpp
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@ -121,6 +121,14 @@ public:
*/
explicit config(config_key_type child);
/**
* Creates a config with several attributes and children.
* Pass the keys/tags and values/children alternately.
* @example config("key", 42, "value", config())
*/
template<typename... T>
explicit config(config_key_type first, T&&... args);
~config();
// Verifies that the string can be used as an attribute or tag name
@ -744,6 +752,57 @@ private:
std::vector<child_pos> ordered_children;
};
namespace detail {
template<typename... T>
struct config_construct_unpacker;
template<>
struct config_construct_unpacker<>
{
void visit(config&) {}
};
template<typename K, typename V, typename... Rest>
struct config_construct_unpacker<K, V, Rest...>
{
void visit(config& cfg, K&& key, V&& val, Rest... fwd)
{
cfg[std::forward<K>(key)] = std::forward<V>(val);
detail::config_construct_unpacker<Rest...> unpack;
unpack.visit(cfg, std::forward<Rest>(fwd)...);
}
};
template<typename T, typename... Rest>
struct config_construct_unpacker<T, config, Rest...>
{
void visit(config& cfg, T&& tag, config&& child, Rest... fwd)
{
cfg.add_child(std::forward<T>(tag), std::forward<config>(child));
detail::config_construct_unpacker<Rest...> unpack;
unpack.visit(cfg, std::forward<Rest>(fwd)...);
}
};
template<typename T, typename... Rest>
struct config_construct_unpacker<T, config&, Rest...>
{
void visit(config& cfg, T&& tag, config& child, Rest... fwd)
{
cfg.add_child(std::forward<T>(tag), std::forward<config>(child));
detail::config_construct_unpacker<Rest...> unpack;
unpack.visit(cfg, std::forward<Rest>(fwd)...);
}
};
}
template<typename... T>
inline config::config(config_key_type first, T&&... args)
{
detail::config_construct_unpacker<config_key_type, T...> unpack;
unpack.visit(*this, first, std::forward<T>(args)...);
}
class variable_set
{
public: