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#include "OperandT.h"
template <typename T>
const T OperandT<T>::ZERO = static_cast<T>( static_cast<float>(1e-7) );
创建索引 db.user_tracking.ensureIndex（{“loc”：“2dsphere”}）
我有这个错误：
{"_id" : ObjectId("58240d6eb3fe299a1f28bdf0"),
"id" : NumberLong(52),
"user_id" : NumberLong(2),
"user_type" : "wcities",
"type_id" : "399278",
"type" : "poi",
"type_name" : "Kala Ghoda Amphitheatre",
"attending" : NumberLong(0),
"domain" : "",
"track_time" : "0000-00-00 00:00:00",
"latitude" : "18.92728500",
"longitude" : "72.83274200",
"fb_postid" : "",
"event_date" : "0000-00-00",
"m_event_date" : NumberLong("-62169984000"),
"m_type_id" : "poi__399278",
"loc" : {
"type" : "Point",
"coordinates" : [
18.927285,
72.832742
]
}