Deduction guides

If possible, concurrent_vector constructors support class template argument deduction (since C++17). The following constructors provide implicitly-generated deduction guides:

  • Copy and move constructors, including constructors with explicit allocator_type argument

  • Constructors, accepting std::initializer_list as an argument

In addition, the following explicit deduction guide is provided:

template <typename InputIterator,
          typename Allocator = tbb::cache_aligned_allocator<iterator_value_t<InputIterator>>>
concurrent_vector( InputIterator, InputIterator,
                   Allocator = Allocator() )
-> concurrent_vector<iterator_value_t<InputIterator>,
                     Allocator>;

Where type alias iterator_value_t defines as follows:

template <typename InputIterator>
using iterator_value_t = typename std::iterator_traits<InputIterator>::value_type;

This deduction guide only participate in the overload resolution if the following requirements are met:

  • The InputIterator type meets the InputIterator requirements described in the [input.iterators] section of the ISO C++ Standard.

  • The Allocator type meets the Allocator requirements described in the [allocator.requirements] section of the ISO C++ Standard.

Example

#include <oneapi/tbb/concurrent_vector.h>
#include <array>
#include <memory>

int main() {
    std::array<int, 100> arr;

    // Deduces cv1 as oneapi::tbb::concurrent_vector<int>
    oneapi::tbb::concurrent_vector cv1(arr.begin(), arr.end());

    std::allocator<int> alloc;


    // Deduces cv2 as oneapi::tbb::concurrent_vector<int, std::allocator<int>>
    oneapi::tbb::concurrent_vector cv2(arr.begin(), arr.end(), alloc);
}

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