[c++] optimize parse json

[AxiosLeo]

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[codecov-commenter]

Codecov Report

Merging #219 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #219   +/-   ##
=======================================
  Coverage   96.93%   96.93%           
=======================================
  Files           9        9           
  Lines         652      652           
  Branches       17       17           
=======================================
  Hits          632      632           
  Misses         14       14           
  Partials        6        6           

Flag	Coverage Δ
#csharp	100.00% <ø> (ø)
#go	94.87% <ø> (ø)
#java	100.00% <ø> (ø)
#node_js	95.65% <ø> (ø)
#php	100.00% <ø> (?)
#python	100.00% <ø> (ø)
#swift	95.77% <ø> (ø)

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