Deduction guides#
If possible, concurrent_set
constructors support class template argument deduction (since C++17).
Copy and move constructors, including constructors with an explicit allocator_type
argument,
provide implicitly-generated deduction guides.
In addition, the following explicit deduction guides are provided:
template <typename InputIterator,
typename Compare = std::less<iterator_value_t<InputIterator>>,
typename Allocator = tbb::tbb_allocator<iterator_value_t<InputIterator>>>
concurrent_set( InputIterator, InputIterator,
Compare = Compare(),
Allocator = Allocator() )
-> concurrent_set<iterator_value_t<InputIterator>,
Compare,
Allocator>;
template <typename InputIterator,
typename Allocator>
concurrent_set( InputIterator, InputIterator,
Allocator )
-> concurrent_set<iterator_value_t<InputIterator>,
std::less<iterator_value_t<InputIterator>>,
Allocator>;
template <typename Key,
typename Compare = std::less<Key>,
typename Allocator = tbb::tbb_allocator<Key>>
concurrent_set( std::initializer_list<Key>,
Compare = Compare(),
Allocator = Allocator() )
-> concurrent_set<Key,
Compare,
Allocator>;
template <typename Key,
typename Allocator>
concurrent_set( std::initializer_list<Key>,
Allocator )
-> concurrent_set<Key,
std::less<Key>,
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;
These deduction guides only participate in the overload resolution if the following requirements are met:
The
InputIterator
type meets theInputIterator
requirements described in the [input.iterators] section of the ISO C++ Standard.The
Allocator
type meets theAllocator
requirements described in the [allocator.requirements] section of the ISO C++ Standard.The
Compare
type does not meet theAllocator
requirements.
Example
#include <oneapi/tbb/concurrent_set.h>
#include <vector>
int main() {
std::vector<int> v;
// Deduces cs1 as concurrent_set<int>
oneapi::tbb::concurrent_set cs1(v.begin(), v.end());
// Deduces cs2 as concurrent_set<int>
oneapi::tbb::concurrent_set cs2({1, 2, 3});
}