T2>& p) const {auto h1 = std::hash<T1>{}(p.first);auto h2 = std::hash<T2>{}(p.second);// Mainly for demonstration purposes, i.e. it works but is overly simple// In the real world, use a better hash combining functionreturn h1 ^ h2;}};std::unordered_map<std...
std::move和std::forward只是执行转换的函数(确切的说应该是函数模板)。std::move无条件的将它的参数转...
use of deleted function \xe2\x80\x98constexpr std::pair<_T1, _T2>::pair(std::pair<_T1, _T2>&&) [with _T1 = int; _T2 = std::mutex; std::pair<_T1, _T2> = std::pair<int, std::mutex>]\xe2\x80\x99\n/usr/include/c++/4.7/bits/stl_pair.h:120:17: note: \xe2\x80\x98...
5): message : ‘std::pair<const int,X>::pair(const std::pair<const int,X> &)’: function was implicitly deleted because a data member invokes a deleted or inaccessible function ‘X::X(const X &)’
This is not a bug report, more of an interesting data point. In the past week I've been trying out absl::flat_hash_map and google::dense_hash_map (and sets) and comparing performance to STL counterparts. The following gist contains bench...