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A simple representation for the Spanner JSON type: a lightweight, text-based, language-independent data interchange format.
JSON (the JavaScript Object Notation) defines a small set of formatting rules for the portable representation of structured data. See RFC 7159.
A Json value can be constructed from, and converted to a std::string. Json values can be compared (by string) for equality, and streamed.
There is no syntax checking of JSON strings in this interface. The user is expected to only construct Json values from well-formatted strings.
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson const &
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson &&
A null value.
Json(std::string)Construction from a JSON-formatted string.
Note that there is no check here that the argument string is indeed well-formatted. Error detection will be delayed until the value is passed to Spanner.
Parameter Name Descriptions std::string
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson const &
Json & operator=(Json &&)
Regular value type, supporting copy, assign, move.
Parameter Name DescriptionJson &&
Json & operator std::string() const &
Conversion to a JSON-formatted string.
operator std::string() &&Conversion to a JSON-formatted string.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["The page documents the `Json` class within the Google Cloud Spanner C++ client library, with versions ranging from 2.11.0 to the latest release candidate 2.37.0-rc."],["The `Json` class represents a lightweight, text-based, language-independent data interchange format, following the formatting rules defined in RFC 7159 for the portable representation of structured data."],["`Json` values can be constructed from and converted to `std::string`, and they can be compared for equality and streamed, without any syntax checking of the JSON strings performed by the class."],["The `Json` class supports various constructors, including a default constructor for creating null values and a constructor for creating instances from a JSON-formatted string, along with copy and move constructors."],["The class also includes `operator=` for assignment, and `operator std::string()` for converting `Json` objects to JSON-formatted strings, available for both lvalue and rvalue references."]]],[]]
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