37 lines
836 B
D
37 lines
836 B
D
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module model.base;
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/**
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* The base class for all persistent entities with a unique integer id.
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* It offers some basic utilities like equality and comparison by default.
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*/
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abstract class IdEntity {
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const ulong id;
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this(ulong id) {
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this.id = id;
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}
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override bool opEquals(Object other) const {
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if (IdEntity e = cast(IdEntity) other) {
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return e.id == id;
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}
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return false;
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}
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override size_t toHash() const {
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import std.conv : to;
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return id.to!size_t;
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}
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override string toString() const {
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import std.format : format;
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return format!"IdEntity(id = %d)"(id);
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}
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override int opCmp(Object other) const {
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if (IdEntity e = cast(IdEntity) other) {
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return this.id < e.id;
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}
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return 1;
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}
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}
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