std::data
From cppreference.com
Defined in header
<iterator>
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Defined in header
<array>
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Defined in header
<deque>
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Defined in header
<forward_list>
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Defined in header
<list>
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Defined in header
<map>
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Defined in header
<regex>
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Defined in header
<set>
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Defined in header
<string>
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Defined in header
<unordered_map>
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Defined in header
<unordered_set>
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Defined in header
<vector>
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template <class C>
constexpr auto data(C& c) -> decltype(c.data()); |
(1) | (since C++17) |
template <class C>
constexpr auto data(const C& c) -> decltype(c.data()); |
(2) | (since C++17) |
template <class T, std::size_t N>
constexpr T* data(T (&array)[N]) noexcept; |
(3) | (since C++17) |
template <class E>
constexpr const E* data(std::initializer_list<E> il) noexcept; |
(4) | (since C++17) |
Returns a pointer to the block of memory containing the elements of the container.
1,2) returns c.data()
3) returns array
4) returns il.begin()
Contents |
[edit] Parameters
c | - | a container with a data() method |
array | - | an array of arbitrary type |
il | - | an initializer list |
[edit] Return value
A pointer to the block of memory containing the elements of the container.
[edit] Exceptions
3,4)
noexcept specification:
noexcept
[edit] Possible implementation
First version |
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template <class C> constexpr auto data(C& c) -> decltype(c.data()); { return c.data(); } |
Second version |
template <class C> constexpr auto data(const C& c) -> decltype(c.data()); { return c.data(); } |
Third version |
template <class T, std::size_t N> constexpr T* data(T (&array)[N]) noexcept; { return array; } |
Fourth version |
template <class E> constexpr const E* data(std::initializer_list<E> il) noexcept; { return il.begin(); } |
[edit] Example
This section is incomplete Reason: no example |