CPP escapes json string

A json string variable is

{
    "a": 1,
    "b": 2
}

wants to escape as the json string {"a": 1, "b", 2}.
is a variable, so there is no way to use R "()". The json library uses jsoncpp
is there any good way?

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-7c2d76-13d5a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-7c2d76-13d5a.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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