Move ECS to Bubel module
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46 changed files with 163 additions and 154 deletions
295
source/bubel/ecs/hash_map.d
Executable file
295
source/bubel/ecs/hash_map.d
Executable file
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module bubel.ecs.hash_map;
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import std.traits;
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import bubel.ecs.vector;
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import bubel.ecs.traits;
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enum doNotInline = "version(DigitalMars)pragma(inline,false);version(LDC)pragma(LDC_never_inline);";
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private enum HASH_EMPTY = 0;
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private enum HASH_DELETED = 0x1;
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private enum HASH_FILLED_MARK = ulong(1) << 8 * ulong.sizeof - 1;
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export ulong defaultHashFunc(T)(auto ref T t) nothrow @nogc {
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static if (isIntegral!(T)) {
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return hashInt(t);
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} else {
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return 0;//hashInt(t.hashOf); // hashOf is not giving proper distribution between H1 and H2 hash parts
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}
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}
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// Can turn bad hash function to good one
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export ulong hashInt(ulong x) nothrow @nogc @safe {
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x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
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x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
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x = x ^ (x >> 31);
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return x;
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}
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struct HashMap(KeyPar, ValuePar, alias hashFunc = defaultHashFunc) {
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alias Key = KeyPar;
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alias Value = ValuePar;
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nothrow:
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enum rehashFactor = 0.75;
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enum size_t getIndexEmptyValue = size_t.max;
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static struct KeyVal {
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Key key;
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Value value;
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}
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static struct Bucket {
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ulong hash;
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KeyVal keyValue;
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}
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Vector!Bucket elements; // Length should be always power of 2
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size_t length; // Used to compute loadFactor
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size_t markerdDeleted;
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export void clear() {
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elements.clear();
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length = 0;
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markerdDeleted = 0;
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}
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export void reset() {
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elements.reset();
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length = 0;
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markerdDeleted = 0;
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}
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export bool isIn(ref Key el) {
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return getIndex(el) != getIndexEmptyValue;
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}
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export bool isIn(Key el) {
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return getIndex(el) != getIndexEmptyValue;
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}
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export Value* getPtr()(auto ref Key k) {
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size_t index = getIndex(k);
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if (index == getIndexEmptyValue) {
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return null;
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} else {
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return &elements[index].keyValue.value;
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}
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}
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export ref Value get()(auto ref Key k) {
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size_t index = getIndex(k);
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assert(index != getIndexEmptyValue);
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return elements[index].keyValue.value;
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}
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deprecated("Use get with second parameter.") export auto ref Value getDefault()(
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auto ref Key k, auto ref Value defaultValue) {
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return get(k, defaultValue);
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}
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export auto ref Value get()(auto ref Key k, auto ref Value defaultValue) {
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size_t index = getIndex(k);
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if (index == getIndexEmptyValue) {
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return defaultValue;
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} else {
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return elements[index].keyValue.value;
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}
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}
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export ref Value getInsertDefault()(auto ref Key k, auto ref Value defaultValue) {
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size_t index = getIndex(k);
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if (index == getIndexEmptyValue) {
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add(k, defaultValue);
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}
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index = getIndex(k);
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assert(index != getIndexEmptyValue);
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return elements[index].keyValue.value;
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}
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export bool tryRemove(Key el) {
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size_t index = getIndex(el);
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if (index == getIndexEmptyValue) {
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return false;
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}
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length--;
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elements[index].hash = HASH_DELETED;
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markerdDeleted++;
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return true;
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}
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export void remove(Key el) {
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bool ok = tryRemove(el);
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assert(ok);
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}
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export ref Value opIndex()(auto ref Key key) {
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return get(key);
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}
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export void opIndexAssign()(auto ref Value value, auto ref Key key) {
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add(key, value);
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}
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export void add()(auto ref Key key, auto ref Value value) {
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size_t index = getIndex(key);
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if (index != getIndexEmptyValue) {
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elements[index].keyValue.value = value;
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return;
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}
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if (getLoadFactor(length + 1) > rehashFactor
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|| getLoadFactor(length + markerdDeleted) > rehashFactor) {
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rehash();
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}
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length++;
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immutable ulong hash = hashFunc(key) | HASH_FILLED_MARK;
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immutable size_t rotateMask = elements.length - 1;
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index = hash & rotateMask; // Starting point
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while (true) {
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Bucket* gr = &elements[index];
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if ((gr.hash & HASH_FILLED_MARK) == 0) {
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if (gr.hash == HASH_DELETED) {
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markerdDeleted--;
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}
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gr.hash = hash;
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gr.keyValue.key = key;
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gr.keyValue.value = value;
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return;
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}
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index++;
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index = index & rotateMask;
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}
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}
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// For debug
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//int numA;
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//int numB;
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export size_t getIndex(Key el) {
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return getIndex(el);
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}
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export size_t getIndex(ref Key el) {
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mixin(doNotInline);
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immutable size_t groupsLength = elements.length;
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if (groupsLength == 0) {
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return getIndexEmptyValue;
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}
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immutable ulong hash = hashFunc(el) | HASH_FILLED_MARK;
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immutable size_t rotateMask = groupsLength - 1;
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size_t index = hash & rotateMask; // Starting point
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//numA++;
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while (true) {
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//numB++;
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Bucket* gr = &elements[index];
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if (gr.hash == hash && gr.keyValue.key == el) {
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return index;
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}
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if (gr.hash == HASH_EMPTY) {
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return getIndexEmptyValue;
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}
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index++;
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index = index & rotateMask;
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}
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}
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export float getLoadFactor(size_t forElementsNum) {
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if (elements.length == 0) {
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return 1;
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}
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return cast(float) forElementsNum / (elements.length);
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}
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export void rehash()() {
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mixin(doNotInline);
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// Get all elements
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Vector!KeyVal allElements;
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allElements.reserve(elements.length);
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foreach (ref Bucket el; elements) {
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if ((el.hash & HASH_FILLED_MARK) == 0) {
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el.hash = HASH_EMPTY;
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continue;
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}
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el.hash = HASH_EMPTY;
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allElements ~= el.keyValue;
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}
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if (getLoadFactor(length + 1) > rehashFactor) { // Reallocate
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elements.length = (elements.length ? elements.length : 4) << 1; // Power of two, initially 8 elements
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}
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// Insert elements
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foreach (i, ref el; allElements) {
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add(el.key, el.value);
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}
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length = allElements.length;
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markerdDeleted = 0;
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}
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// foreach support
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export int opApply(DG)(scope DG dg) {
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int result;
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foreach (ref Bucket gr; elements) {
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if ((gr.hash & HASH_FILLED_MARK) == 0) {
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continue;
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}
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static if (isForeachDelegateWithTypes!(DG, Key)) {
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result = dg(gr.keyValue.key);
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} else static if (isForeachDelegateWithTypes!(DG, Value)) {
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result = dg(gr.keyValue.value);
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} else static if (isForeachDelegateWithTypes!(DG, Key, Value)) {
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result = dg(gr.keyValue.key, gr.keyValue.value);
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} else {
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static assert(0);
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}
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if (result)
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break;
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}
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return result;
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}
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export int byKey(scope int delegate(Key k) nothrow dg) {
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int result;
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foreach (ref Key k; this) {
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result = dg(k);
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if (result)
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break;
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}
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return result;
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}
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export int byValue(scope int delegate(ref Value k) nothrow dg) {
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int result;
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foreach (ref Value v; this) {
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result = dg(v);
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if (result)
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break;
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}
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return result;
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}
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export int byKeyValue(scope int delegate(ref Key k, ref Value v) nothrow dg) {
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int result;
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foreach (ref Key k, ref Value v; this) {
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result = dg(k, v);
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if (result)
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break;
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}
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return result;
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}
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}
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