88 lines
1.8 KiB
C++
88 lines
1.8 KiB
C++
#ifndef value_hh_INCLUDED
|
|
#define value_hh_INCLUDED
|
|
|
|
#include "hash_map.hh"
|
|
#include "units.hh"
|
|
#include "meta.hh"
|
|
|
|
#include <type_traits>
|
|
#include <memory>
|
|
|
|
namespace Kakoune
|
|
{
|
|
|
|
struct bad_value_cast {};
|
|
|
|
struct Value
|
|
{
|
|
Value() = default;
|
|
|
|
template<typename T> requires (not std::is_same_v<Value, T>)
|
|
Value(T&& val)
|
|
: m_value{new Model<std::remove_cvref_t<T>>{std::forward<T>(val)}} {}
|
|
|
|
template<typename T>
|
|
Value(Meta::Type<T>, auto&&... args) :
|
|
m_value(new Model<T>(std::forward<decltype(args)>(args)...)) {}
|
|
|
|
Value(const Value& val) = delete;
|
|
Value(Value&&) = default;
|
|
|
|
Value& operator=(const Value& val) = delete;
|
|
Value& operator=(Value&& val) = default;
|
|
|
|
explicit operator bool() const { return (bool)m_value; }
|
|
|
|
template<typename T>
|
|
bool is_a() const
|
|
{
|
|
return m_value and m_value->type() == typeid(T);
|
|
}
|
|
|
|
template<typename T>
|
|
T& as()
|
|
{
|
|
if (not is_a<T>())
|
|
throw bad_value_cast{};
|
|
return static_cast<Model<T>*>(m_value.get())->m_content;
|
|
}
|
|
|
|
template<typename T>
|
|
const T& as() const
|
|
{
|
|
return const_cast<Value*>(this)->as<T>();
|
|
}
|
|
|
|
private:
|
|
struct Concept
|
|
{
|
|
virtual ~Concept() = default;
|
|
virtual const std::type_info& type() const = 0;
|
|
};
|
|
|
|
template<typename T>
|
|
struct Model : public Concept, public UseMemoryDomain<MemoryDomain::Values>
|
|
{
|
|
Model(auto&&... args) : m_content(std::forward<decltype(args)>(args)...) {}
|
|
const std::type_info& type() const override { return typeid(T); }
|
|
|
|
T m_content;
|
|
};
|
|
|
|
std::unique_ptr<Concept> m_value;
|
|
};
|
|
|
|
enum class ValueId : int {};
|
|
|
|
inline ValueId get_free_value_id()
|
|
{
|
|
static int next = 0;
|
|
return (ValueId)(next++);
|
|
}
|
|
|
|
using ValueMap = HashMap<ValueId, Value, MemoryDomain::Values>;
|
|
|
|
}
|
|
|
|
#endif // value_hh_INCLUDED
|