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50 lines
1.7 KiB
50 lines
1.7 KiB
// Copyright (C) MongoDB, Inc. 2017-present.
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License. You may obtain
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// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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//
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// Based on gopkg.in/mgo.v2/bson by Gustavo Niemeyer
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// See THIRD-PARTY-NOTICES for original license terms.
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// +build go1.9
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package bson // import "go.mongodb.org/mongo-driver/bson"
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import (
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"go.mongodb.org/mongo-driver/bson/primitive"
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)
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// Zeroer allows custom struct types to implement a report of zero
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// state. All struct types that don't implement Zeroer or where IsZero
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// returns false are considered to be not zero.
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type Zeroer interface {
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IsZero() bool
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}
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// D is an ordered representation of a BSON document. This type should be used when the order of the elements matters,
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// such as MongoDB command documents. If the order of the elements does not matter, an M should be used instead.
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//
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// Example usage:
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//
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// bson.D{{"foo", "bar"}, {"hello", "world"}, {"pi", 3.14159}}
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type D = primitive.D
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// E represents a BSON element for a D. It is usually used inside a D.
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type E = primitive.E
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// M is an unordered representation of a BSON document. This type should be used when the order of the elements does not
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// matter. This type is handled as a regular map[string]interface{} when encoding and decoding. Elements will be
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// serialized in an undefined, random order. If the order of the elements matters, a D should be used instead.
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//
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// Example usage:
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//
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// bson.M{"foo": "bar", "hello": "world", "pi": 3.14159}
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type M = primitive.M
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// An A is an ordered representation of a BSON array.
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//
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// Example usage:
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//
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// bson.A{"bar", "world", 3.14159, bson.D{{"qux", 12345}}}
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type A = primitive.A
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