add type BasicStringPiece::const_pointer, make it like string_view and more convenient #2141
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What problem does this PR solve?
add type BasicStringPiece::const_pointer, make it like string_view and more convenient.
e.g. we can using butil::StringPiece as a key to invoking folly::F14FastMap heterogeneous accessing method by this mr make butil::StringPiece like string_view which can implicitly convert to folly::StringPiece
What is changed and the side effects?
Changed:
Side effects:
none
none