Deduction guides¶
Where possible, constructors of tbb::concurrent_queue support class template argument
deduction (since C++17):
template <typename InputIterator,
typename Allocator = cache_aligned_allocator<iterator_value_t<InputIterator>>
concurrent_queue( InputIterator, InputIterator, const Allocator& = Allocator() )
-> concurrent_queue<iterator_value_t<InputIterator>, Allocator>;
Where the type alias iterator_value_t is defined as follows:
template <typename InputIterator>
using iterator_value_t = typename std::iterator_traits<InputIterator>::value_type;
Example
#include <tbb/concurrent_queue.h>
#include <vector>
#include <memory>
int main() {
std::vector<int> vec;
// Deduces cq1 as tbb::concurrent_queue<int>
tbb::concurrent_queue cq1(vec.begin(), vec.end());
// Deduces cq2 as tbb::concurrent_queue<int, std::allocator<int>>
tbb::concurrent_queue cq2(vec.begin(), vec.end(), std::allocator<int>{})
}