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ilpropheta/Silly fetch_or_insert.cpp Secret

Created July 16, 2016 14:52
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Silly fetch_or_insert.cpp
template<typename Gen>
ValueType fetch_or_insert(const Key& key, Gen g)
{
auto it = data.find(key);
if (it != end(data))
{
return it->second;
}
return data.emplace(key, g()).first->second;
}
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