Github user mygityf commented on the pull request:
https://github.com/apache/thrift/pull/864#issuecomment-184034288
The precision is 15 bits after dot of format casting from double to string
in Thrift-cpp-library- json-protocol.
But the precision is 16 bits after dot in Thrift-lua-library-json-protocol.
So, test with C++ server is break.
@nsuke can we modify the precision to 16 bits for C++ server?
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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