[C++] error: call-to-implicitly-deleted-default-constructor _
created at 11-16-2021
views: 225
Preface¶
The compilation error caused when using the unordered_set container, the literal translation is to call the implicitly deleted default constructor.
unordered_map<pair<int, int>>
unordered_set<pair<int, int>>
reason¶
Both unordered_map and unordered_set use the default std::hash to calculate the key, and std::hash cannot handle the pair type.
solution¶
Use map, set instead
Custom hash function
