ladybird/AK/Traits.h
Andreas Kling fdcff7d15e AK: Make it possible to use HashMap<K, NonnullOwnPtr>::get()
Add the concept of a PeekType to Traits<T>. This is the type we'll
return (wrapped in an Optional) from HashMap::get().

The PeekType for OwnPtr<T> and NonnullOwnPtr<T> is const T*,
which means that HashMap::get() will return an Optional<const T*> for
maps-of-those.
2019-08-14 11:47:38 +02:00

59 lines
1.6 KiB
C++

#pragma once
#include "HashFunctions.h"
#include "kstdio.h"
namespace AK {
template<typename T>
struct GenericTraits {
using PeekType = T;
static constexpr bool is_trivial() { return false; }
static bool equals(const T& a, const T& b) { return a == b; }
};
template<typename T>
struct Traits : public GenericTraits<T> {
};
template<>
struct Traits<int> : public GenericTraits<int> {
static constexpr bool is_trivial() { return true; }
static unsigned hash(int i) { return int_hash(i); }
static void dump(int i) { kprintf("%d", i); }
};
template<>
struct Traits<unsigned> : public GenericTraits<unsigned> {
static constexpr bool is_trivial() { return true; }
static unsigned hash(unsigned u) { return int_hash(u); }
static void dump(unsigned u) { kprintf("%u", u); }
};
template<>
struct Traits<u16> : public GenericTraits<u16> {
static constexpr bool is_trivial() { return true; }
static unsigned hash(u16 u) { return int_hash(u); }
static void dump(u16 u) { kprintf("%u", u); }
};
template<>
struct Traits<char> : public GenericTraits<char> {
static constexpr bool is_trivial() { return true; }
static unsigned hash(char c) { return int_hash(c); }
static void dump(char c) { kprintf("%c", c); }
};
template<typename T>
struct Traits<T*> : public GenericTraits<T*> {
static unsigned hash(const T* p)
{
return int_hash((unsigned)(__PTRDIFF_TYPE__)p);
}
static constexpr bool is_trivial() { return true; }
static void dump(const T* p) { kprintf("%p", p); }
static bool equals(const T* a, const T* b) { return a == b; }
};
}