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block_cache_tier: fix gcc-7 warnings 

Summary:
Error was:

utilities/persistent_cache/block_cache_tier.cc: In instantiation of ‘void rocksdb::Add(std::map<std::__cxx11::basic_string<char>, double>*, const string&, const T&) [with T = double; std::__cxx11::string = std::__cxx11::basic_string<char>]’:
utilities/persistent_cache/block_cache_tier.cc:147:40:   required from here
utilities/persistent_cache/block_cache_tier.cc:141:23: error: type qualifiers ignored on cast result type [-Werror=ignored-qualifiers]

   stats->insert({key, static_cast<const double>(t)});

fixing like #2562
Closes https://github.com/facebook/rocksdb/pull/2603

Differential Revision: D5600910

Pulled By: yiwu-arbug

fbshipit-source-id: 891a5ec7e451d2dec6ad1b6b7fac545657f87363
This commit is contained in:
Daniel Black 2017-08-10 11:56:46 -07:00 committed by Facebook Github Bot
parent 0cecf8155b
commit 64f8484356
1 changed files with 1 additions and 1 deletions
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utilities/persistent_cache/block_cache_tier.cc
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@ -136,7 +136,7 @@ Status BlockCacheTier::Close() {
template<class T>
void Add(std::map<std::string, double>* stats, const std::string& key,
const T& t) {
stats->insert({key, static_cast<const double>(t)});
stats->insert({key, static_cast<double>(t)});
}
PersistentCache::StatsType BlockCacheTier::Stats() {