Returns a pointer to the underlying character array. The pointer is such that the range[data(), data()+ size()) is valid and the values in it correspond to the values of the view.

[edit]Parameters

(none)

[edit]Return value

A pointer to the underlying character array.

[edit]Complexity

Constant.

[edit]Notes

Unlikestd::basic_string::data() and string literals,std::basic_string_view::data() returns a pointer to a buffer that is not necessarily null-terminated, for example a substring view (e.g. fromremove_suffix). Therefore, it is typically a mistake to passdata() to a routine that takes just aconst CharT* and expects a null-terminated string.

[edit]Example

#include <cstring>#include <cwchar>#include <iostream>#include <string>#include <string_view> int main(){std::wstring_view wcstr_v= L"xyzzy";std::cout<<std::wcslen(wcstr_v.data())<<'\n';// OK: the underlying character array is null-terminated char array[3]={'B','a','r'};std::string_view array_v(array, sizeof array);// std::cout << std::strlen(array_v.data()) << '\n';// error: the underlying character array is not null-terminated std::string str(array_v.data(), array_v.size());// OKstd::cout<<std::strlen(str.data())<<'\n';// OK: the underlying character array of a std::string is always null-terminated}

53

[edit]See also

• In other languages

• Español
• 日本語
• 中文