45 lines
1.2 KiB
C++
45 lines
1.2 KiB
C++
/* OctaSTD extensions for std::vector.
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*
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* This file is part of OctaSTD. See COPYING.md for futher information.
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*/
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#ifndef OSTD_VECTOR_HH
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#define OSTD_VECTOR_HH
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#include <vector>
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#include <memory>
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#include <type_traits>
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#include "ostd/range.hh"
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namespace ostd {
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template<typename T, typename A = std::allocator<T>, typename R>
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inline std::vector<T, A> make_vector(R range, A const &alloc = A{}) {
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std::vector<T, A> ret{alloc};
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using C = range_category_t<R>;
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if constexpr(std::is_convertible_v<C, finite_random_access_range_tag>) {
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/* finite random access or contiguous */
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auto h = range.half();
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ret.reserve(range.size());
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ret.insert(ret.end(), h, h + range.size());
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} else {
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/* infinite random access and below */
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for (; !range.empty(); range.pop_front()) {
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ret.push_back(range.front());
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}
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}
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return ret;
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}
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template<typename R, typename A = std::allocator<range_value_t<R>>>
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inline std::vector<range_value_t<R>, A> make_vector(
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R &&range, A const &alloc = A{}
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) {
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return make_vector<range_value_t<R>, A>(std::forward<R>(range), alloc);
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}
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} /* namespace ostd */
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#endif
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