[jira] [Updated] (THRIFT-3636) Double precision is not fully preserved in C++ TJSONProtocol

["Aki Sukegawa (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/THRIFT-3636?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aki Sukegawa updated THRIFT-3636:
---------------------------------
    Summary: Double precision is not fully preserved in C++ TJSONProtocol  (was: The precision is 15 bits after dot of casting from double to string in Thrift-cpp-library- json-protocol.)

> Double precision is not fully preserved in C++ TJSONProtocol
> ------------------------------------------------------------
>
>                 Key: THRIFT-3636
>                 URL: https://issues.apache.org/jira/browse/THRIFT-3636
>             Project: Thrift
>          Issue Type: Bug
>          Components: C++ - Library
>    Affects Versions: 0.9.3
>         Environment: Linux Mac Windows
>            Reporter: WangYaofu
>            Assignee: WangYaofu
>             Fix For: 0.9.4
>
>
> The precision is 15 bits after dot of format casting from double to string in Thrift-cpp-library- json-protocol.
> But the expected precision is 16 bits after dot in Thrift-json-protocol.
> The solution:
> To Change code 'str.precision(std::numeric_limits<double>::digits10 + 1);' to 'str.precision(std::numeric_limits<double>::digits10 + 2);'
> in function doubeToString file TJSONProtocol.cpp at line 524,
> e.g:
> before:
> In C++ TJsonProtocol.cpp:
> double a = 1.12345678906666663;
> string astr = doubleToString(a);
> double b = stringToDouble(astr);
> the result as below:
> a = 1.1234567890666667
> astr = "1.123456789066667"
> b = 1.1234567890666669
> after changing:
> the result as below:
> a = 1.1234567890666667
> astr = "1.1234567890666667"
> b = 1.1234567890666667
> This result is expected.



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