47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
#ifndef MAKE_UNIQUE_H_
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#define MAKE_UNIQUE_H_
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#include <cstdlib>
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#include <memory>
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#include <type_traits>
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namespace osrm
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{
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// Implement make_unique according to N3656. Taken from libcxx's implementation
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/// \brief Constructs a `new T()` with the given args and returns a
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/// `unique_ptr<T>` which owns the object.
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///
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/// Example:
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///
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/// auto p = make_unique<int>();
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/// auto p = make_unique<std::tuple<int, int>>(0, 1);
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template <class T, class... Args>
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typename std::enable_if<!std::is_array<T>::value, std::unique_ptr<T>>::type
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make_unique(Args &&... args)
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{
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return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
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}
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/// \brief Constructs a `new T[n]` with the given args and returns a
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/// `unique_ptr<T[]>` which owns the object.
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///
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/// \param n size of the new array.
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///
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/// Example:
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///
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/// auto p = make_unique<int[]>(2); // value-initializes the array with 0's.
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template <class T>
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typename std::enable_if<std::is_array<T>::value && std::extent<T>::value == 0,
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std::unique_ptr<T>>::type
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make_unique(size_t n)
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{
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return std::unique_ptr<T>(new typename std::remove_extent<T>::type[n]());
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}
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/// This function isn't used and is only here to provide better compile errors.
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template <class T, class... Args>
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typename std::enable_if<std::extent<T>::value != 0>::type make_unique(Args &&...) = delete;
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}
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#endif // MAKE_UNIQUE_H_
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