[Cppcms-users] In json.cpp and json.h I did not see the declare of the parse_stream function but you use it on json.cpp in 1051 line.why /?

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Hello:
when I read the source code. In json.cpp and json.h I did not see the declare of the parse_stream function  but you use it on json.cpp in 1051 line.why /?
 I don not know why? please help me .thank you very much!