template< class C >
constexpr auto data( C& c ) -> decltype(c.data());
template< class C >
constexpr auto data( const C& c ) -> decltype(c.data());
Returns a pointer to the block of memory containing the elements of the range.
1,2) Returns c.data().
3) Returns array.
4) Returns il.begin().
[edit] Parameters c - a container or view with a data() member function array - an array of arbitrary type il - an std::initializer_list [edit] Return value1,2) c.data()
3) array
4) il.begin()
[edit] Exceptions1) May throw implementation-defined exceptions.
[edit] NotesThe overload for std::initializer_list is necessary because it does not have a member function data.
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
#include <cstring>
#include <iostream>
#include <string>
int main()
{
std::string s{"Hello world!\n"};
char a[20]; // storage for a C-style string
std::strcpy(a, std::data(s));
// [s.data(), s.data() + s.size()] is guaranteed to be an NTBS since C++11
std::cout << a;
}
Output:
[edit] See also obtains a pointer to the beginning of a contiguous rangeRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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