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.
Constructors
Json(Json const &)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
Json const &
Json(Json &&)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
Json &&
Json()
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
Description
s
std::string
Operators
operator=(Json const &)
Regular value type, supporting copy, assign, move.
Parameter
Name
Description
Json const &
Returns
Type
Description
Json &
operator=(Json &&)
Regular value type, supporting copy, assign, move.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-22 UTC."],[[["\u003cp\u003eThe provided content is a reference document for the \u003ccode\u003eJson\u003c/code\u003e class within the Google Cloud Spanner C++ library, detailing its various versions.\u003c/p\u003e\n"],["\u003cp\u003eVersion 2.37.0-rc is the latest release candidate, while 2.18.0 is the version of focus for the specific documentation.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eJson\u003c/code\u003e class represents a lightweight, text-based data interchange format compatible with RFC 7159, primarily for portable representation of structured data.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eJson\u003c/code\u003e values can be created from and transformed into \u003ccode\u003estd::string\u003c/code\u003e, allow for string-based comparisons, and can be streamed.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eJson\u003c/code\u003e class includes constructors for null values, copy operations, move operations, and for creating \u003ccode\u003eJson\u003c/code\u003e objects from well-formatted JSON strings, but does not validate the string format upon construction.\u003c/p\u003e\n"]]],[],null,[]]
