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Add comments to a singleton. #11333

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merged 2 commits into from
Jun 11, 2018
Merged

Add comments to a singleton. #11333

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4627c0c
add comment to singleton
gongweibao Jun 10, 2018
f74734d
fix style
gongweibao Jun 10, 2018
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3 changes: 3 additions & 0 deletions paddle/fluid/framework/data_type.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,9 @@ struct DataTypeMap {
};

static DataTypeMap* InitDataTypeMap();
// C++11 removes the need for manual locking. Concurrent execution shall wait if
// a static local variable is already being initialized.
// https://stackoverflow.com/questions/11711920/how-to-implement-multithread-safe-singleton-in-c11-without-using-mutex
static DataTypeMap& gDataTypeMap() {
static DataTypeMap* g_data_type_map_ = InitDataTypeMap();
return *g_data_type_map_;
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