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Add dict support for rvalue references and C++11 move semantics.

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This commit is contained in:
Alberto Gonzalez 2020-04-13 19:59:29 +00:00
parent 840bb17089
commit c479fdeb85
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GPG key ID: 8395A8BA109708B2
1 changed files with 38 additions and 4 deletions
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42
kernel/hashlib.h
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@ -314,11 +314,11 @@ class dict
int do_insert(const K &key, int &hash) int do_insert(const K &key, int &hash)
{ {
if (hashtable.empty()) { if (hashtable.empty()) {
entries.push_back(entry_t(std::pair<K, T>(key, T()), -1)); entries.emplace_back(std::pair<K, T>(key, T()), -1);
do_rehash(); do_rehash();
hash = do_hash(key); hash = do_hash(key);
} else { } else {
entries.push_back(entry_t(std::pair<K, T>(key, T()), hashtable[hash])); entries.emplace_back(std::pair<K, T>(key, T()), hashtable[hash]);
hashtable[hash] = entries.size() - 1; hashtable[hash] = entries.size() - 1;
} }
return entries.size() - 1; return entries.size() - 1;
@ -327,11 +327,25 @@ class dict
int do_insert(const std::pair<K, T> &value, int &hash) int do_insert(const std::pair<K, T> &value, int &hash)
{ {
if (hashtable.empty()) { if (hashtable.empty()) {
entries.push_back(entry_t(value, -1)); entries.emplace_back(value, -1);
do_rehash(); do_rehash();
hash = do_hash(value.first); hash = do_hash(value.first);
} else { } else {
entries.push_back(entry_t(value, hashtable[hash])); entries.emplace_back(value, hashtable[hash]);
hashtable[hash] = entries.size() - 1;
}
return entries.size() - 1;
}
int do_insert(std::pair<K, T> &&rvalue, int &hash)
{
if (hashtable.empty()) {
auto key = rvalue.first;
entries.emplace_back(std::forward<std::pair<K, T>>(rvalue), -1);
do_rehash();
hash = do_hash(key);
} else {
entries.emplace_back(std::forward<std::pair<K, T>>(rvalue), hashtable[hash]);
hashtable[hash] = entries.size() - 1; hashtable[hash] = entries.size() - 1;
} }
return entries.size() - 1; return entries.size() - 1;
@ -441,6 +455,26 @@ public:
return std::pair<iterator, bool>(iterator(this, i), true); return std::pair<iterator, bool>(iterator(this, i), true);
} }
std::pair<iterator, bool> insert(std::pair<K, T> &&rvalue)
{
int hash = do_hash(rvalue.first);
int i = do_lookup(rvalue.first, hash);
if (i >= 0)
return std::pair<iterator, bool>(iterator(this, i), false);
i = do_insert(std::forward<std::pair<K, T>>(rvalue), hash);
return std::pair<iterator, bool>(iterator(this, i), true);
}
std::pair<iterator, bool> insert(K const &key, T &&rvalue)
{
int hash = do_hash(key);
int i = do_lookup(key, hash);
if (i >= 0)
return std::pair<iterator, bool>(iterator(this, i), false);
i = do_insert(std::make_pair(key, std::forward<T>(rvalue)), hash);
return std::pair<iterator, bool>(iterator(this, i), true);
}
int erase(const K &key) int erase(const K &key)
{ {
int hash = do_hash(key); int hash = do_hash(key);