(C++17) | ||||
| Sequence | ||||
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(C++26) | ||||
(C++26) | ||||
(C++11) | ||||
| Associative | ||||
| Unordered associative | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
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| Adaptors | ||||
(C++23) | ||||
(C++23) | ||||
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| Views | ||||
(C++20) | ||||
(C++23) | ||||
| Tables | ||||
| Iterator invalidation | ||||
| Member function table | ||||
| Non-member function table |
| Member types | ||||||
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| Helper classes | ||||||
| Deduction guides(C++17) | ||||||
T* data()noexcept; | (1) | (since C++11) (constexpr since C++17) |
const T* data()constnoexcept; | (2) | (since C++11) (constexpr since C++17) |
Returns a pointer to the underlying array serving as element storage. The pointer is such that range[data(), data()+ size()) is always avalid range
If*this is empty,data() is not dereferenceable.
Contents |
Pointer to the underlying element storage. For non-empty containers, the returned pointer compares equal to the address of the first element.
Constant.
If*this is empty,data() may or may not return a null pointer.
#include <cstddef>#include <iostream>#include <span>#include <array> void pointer_func(constint* p,std::size_t size){std::cout<<"data = ";for(std::size_t i=0; i< size;++i)std::cout<< p[i]<<' ';std::cout<<'\n';} void span_func(std::span<constint> data)// since C++20{std::cout<<"data = ";for(constint e: data)std::cout<< e<<' ';std::cout<<'\n';} int main(){std::array<int,4> container{1,2,3,4}; // Prefer container.data() over &container[0] pointer_func(container.data(), container.size()); // std::span is a safer alternative to separated pointer/size. span_func({container.data(), container.size()});}
Output:
data = 1 2 3 4data = 1 2 3 4
| access the first element (public member function)[edit] | |
| access the last element (public member function)[edit] | |
| returns the number of elements (public member function)[edit] | |
| access specified element (public member function)[edit] | |
(C++20) | a non-owning view over a contiguous sequence of objects (class template)[edit] |
(C++17) | obtains the pointer to the underlying array (function template)[edit] |
