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rukletsov/auto_eg.cpp

Last active August 29, 2015 14:18
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auto_eg.cpp
// A case for a more liberal use of `auto`: it's not always easy to get the type correct.
std::map<K, V> data;
for (const std::pair<K, V>& pair : data) {}
for (const auto& pair : data) {}
// First: data.size() copies.
// Second: 0 copies.
// Why? `std::map<K, V>::value_type` is `std::pair<const K, V>`, not `std::pair<K, V>`
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