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/*
* Copyright (C) 2005 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ANDROID_TYPE_HELPERS_H
#define ANDROID_TYPE_HELPERS_H
#include <new>
#include <stdint.h>
#include <string.h>
#include <sys/types.h>
// ---------------------------------------------------------------------------
namespace android {
/*
* Types traits
*/
template <typename T> struct trait_trivial_ctor { enum { value = false }; };
template <typename T> struct trait_trivial_dtor { enum { value = false }; };
template <typename T> struct trait_trivial_copy { enum { value = false }; };
template <typename T> struct trait_trivial_move { enum { value = false }; };
template <typename T> struct trait_pointer { enum { value = false }; };
template <typename T> struct trait_pointer<T*> { enum { value = true }; };
template <typename TYPE>
struct traits {
enum {
// whether this type is a pointer
is_pointer = trait_pointer<TYPE>::value,
// whether this type's constructor is a no-op
has_trivial_ctor = is_pointer || trait_trivial_ctor<TYPE>::value,
// whether this type's destructor is a no-op
has_trivial_dtor = is_pointer || trait_trivial_dtor<TYPE>::value,
// whether this type type can be copy-constructed with memcpy
has_trivial_copy = is_pointer || trait_trivial_copy<TYPE>::value,
// whether this type can be moved with memmove
has_trivial_move = is_pointer || trait_trivial_move<TYPE>::value
};
};
template <typename T, typename U>
struct aggregate_traits {
enum {
is_pointer = false,
has_trivial_ctor =
traits<T>::has_trivial_ctor && traits<U>::has_trivial_ctor,
has_trivial_dtor =
traits<T>::has_trivial_dtor && traits<U>::has_trivial_dtor,
has_trivial_copy =
traits<T>::has_trivial_copy && traits<U>::has_trivial_copy,
has_trivial_move =
traits<T>::has_trivial_move && traits<U>::has_trivial_move
};
};
#define ANDROID_BASIC_TYPES_TRAITS( T ) \
template<> struct trait_trivial_ctor< T > { enum { value = true }; }; \
template<> struct trait_trivial_dtor< T > { enum { value = true }; }; \
template<> struct trait_trivial_copy< T > { enum { value = true }; }; \
template<> struct trait_trivial_move< T > { enum { value = true }; };
// ---------------------------------------------------------------------------
/*
* basic types traits
*/
ANDROID_BASIC_TYPES_TRAITS( void )
ANDROID_BASIC_TYPES_TRAITS( bool )
ANDROID_BASIC_TYPES_TRAITS( char )
ANDROID_BASIC_TYPES_TRAITS( unsigned char )
ANDROID_BASIC_TYPES_TRAITS( short )
ANDROID_BASIC_TYPES_TRAITS( unsigned short )
ANDROID_BASIC_TYPES_TRAITS( int )
ANDROID_BASIC_TYPES_TRAITS( unsigned int )
ANDROID_BASIC_TYPES_TRAITS( long )
ANDROID_BASIC_TYPES_TRAITS( unsigned long )
ANDROID_BASIC_TYPES_TRAITS( long long )
ANDROID_BASIC_TYPES_TRAITS( unsigned long long )
ANDROID_BASIC_TYPES_TRAITS( float )
ANDROID_BASIC_TYPES_TRAITS( double )
// ---------------------------------------------------------------------------
/*
* compare and order types
*/
template<typename TYPE> inline
int strictly_order_type(const TYPE& lhs, const TYPE& rhs) {
return (lhs < rhs) ? 1 : 0;
}
template<typename TYPE> inline
int compare_type(const TYPE& lhs, const TYPE& rhs) {
return strictly_order_type(rhs, lhs) - strictly_order_type(lhs, rhs);
}
/*
* create, destroy, copy and move types...
*/
template<typename TYPE> inline
void construct_type(TYPE* p, size_t n) {
if (!traits<TYPE>::has_trivial_ctor) {
while (n--) {
new(p++) TYPE;
}
}
}
template<typename TYPE> inline
void destroy_type(TYPE* p, size_t n) {
if (!traits<TYPE>::has_trivial_dtor) {
while (n--) {
p->~TYPE();
p++;
}
}
}
template<typename TYPE> inline
void copy_type(TYPE* d, const TYPE* s, size_t n) {
if (!traits<TYPE>::has_trivial_copy) {
while (n--) {
new(d) TYPE(*s);
d++, s++;
}
} else {
memcpy(d,s,n*sizeof(TYPE));
}
}
template<typename TYPE> inline
void splat_type(TYPE* where, const TYPE* what, size_t n) {
if (!traits<TYPE>::has_trivial_copy) {
while (n--) {
new(where) TYPE(*what);
where++;
}
} else {
while (n--) {
*where++ = *what;
}
}
}
template<typename TYPE> inline
void move_forward_type(TYPE* d, const TYPE* s, size_t n = 1) {
if ((traits<TYPE>::has_trivial_dtor && traits<TYPE>::has_trivial_copy)
|| traits<TYPE>::has_trivial_move)
{
memmove(d,s,n*sizeof(TYPE));
} else {
d += n;
s += n;
while (n--) {
--d, --s;
if (!traits<TYPE>::has_trivial_copy) {
new(d) TYPE(*s);
} else {
*d = *s;
}
if (!traits<TYPE>::has_trivial_dtor) {
s->~TYPE();
}
}
}
}
template<typename TYPE> inline
void move_backward_type(TYPE* d, const TYPE* s, size_t n = 1) {
if ((traits<TYPE>::has_trivial_dtor && traits<TYPE>::has_trivial_copy)
|| traits<TYPE>::has_trivial_move)
{
memmove(d,s,n*sizeof(TYPE));
} else {
while (n--) {
if (!traits<TYPE>::has_trivial_copy) {
new(d) TYPE(*s);
} else {
*d = *s;
}
if (!traits<TYPE>::has_trivial_dtor) {
s->~TYPE();
}
d++, s++;
}
}
}
// ---------------------------------------------------------------------------
/*
* a key/value pair
*/
template <typename KEY, typename VALUE>
struct key_value_pair_t {
typedef KEY key_t;
typedef VALUE value_t;
KEY key;
VALUE value;
key_value_pair_t() { }
key_value_pair_t(const key_value_pair_t& o) : key(o.key), value(o.value) { }
key_value_pair_t(const KEY& k, const VALUE& v) : key(k), value(v) { }
key_value_pair_t(const KEY& k) : key(k) { }
inline bool operator < (const key_value_pair_t& o) const {
return strictly_order_type(key, o.key);
}
inline const KEY& getKey() const {
return key;
}
inline const VALUE& getValue() const {
return value;
}
};
template <typename K, typename V>
struct trait_trivial_ctor< key_value_pair_t<K, V> >
{ enum { value = aggregate_traits<K,V>::has_trivial_ctor }; };
template <typename K, typename V>
struct trait_trivial_dtor< key_value_pair_t<K, V> >
{ enum { value = aggregate_traits<K,V>::has_trivial_dtor }; };
template <typename K, typename V>
struct trait_trivial_copy< key_value_pair_t<K, V> >
{ enum { value = aggregate_traits<K,V>::has_trivial_copy }; };
template <typename K, typename V>
struct trait_trivial_move< key_value_pair_t<K, V> >
{ enum { value = aggregate_traits<K,V>::has_trivial_move }; };
// ---------------------------------------------------------------------------
/*
* Hash codes.
*/
typedef uint32_t hash_t;
template <typename TKey>
hash_t hash_type(const TKey& key);
/* Built-in hash code specializations.
* Assumes pointers are 32bit. */
#define ANDROID_INT32_HASH(T) \
template <> inline hash_t hash_type(const T& value) { return hash_t(value); }
#define ANDROID_INT64_HASH(T) \
template <> inline hash_t hash_type(const T& value) { \
return hash_t((value >> 32) ^ value); }
#define ANDROID_REINTERPRET_HASH(T, R) \
template <> inline hash_t hash_type(const T& value) { \
return hash_type(*reinterpret_cast<const R*>(&value)); }
ANDROID_INT32_HASH(bool)
ANDROID_INT32_HASH(int8_t)
ANDROID_INT32_HASH(uint8_t)
ANDROID_INT32_HASH(int16_t)
ANDROID_INT32_HASH(uint16_t)
ANDROID_INT32_HASH(int32_t)
ANDROID_INT32_HASH(uint32_t)
ANDROID_INT64_HASH(int64_t)
ANDROID_INT64_HASH(uint64_t)
ANDROID_REINTERPRET_HASH(float, uint32_t)
ANDROID_REINTERPRET_HASH(double, uint64_t)
template <typename T> inline hash_t hash_type(const T*& value) {
return hash_type(uintptr_t(value));
}
}; // namespace android
// ---------------------------------------------------------------------------
#endif // ANDROID_TYPE_HELPERS_H
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