| Defined in header <iterator> | ||
|---|---|---|
| Defined in header <array> | ||
| Defined in header <deque> | ||
| Defined in header <forward_list> | ||
| Defined in header <list> | ||
| Defined in header <map> | ||
| Defined in header <regex> | ||
| Defined in header <set> | ||
| Defined in header <string> | ||
| Defined in header <unordered_map> | ||
| Defined in header <unordered_set> | ||
| Defined in header <vector> | ||
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() Parameters
| c | - | a container with a data() method |
| array | - | an array of arbitrary type |
| il | - | an initializer list |
Return value
A pointer to the block of memory containing the elements of the container.
Exceptions
3,4)
noexcept specification: noexceptPossible implementation
| First version |
|---|
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();
} |
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