Split util.h
to more concrete util headers
#1144
Merged
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As discussed in #973 (comment), it seems a header file named
util.h
can lead to a disaster: all functions that we do not know where to put will be placed in this file, making this file cluttered and bloated.We need more specific file names rather than
util.h
, so in this PR, we separate functions inutil.h
into different files:string_util.h
,io_util.h
,time_util.h
andthread_util.h
.