[string.view.access] Use shorter forms of return types

Author: frederick-vs-ja

source/strings.tex

@@ -1035,7 +1035,7 @@
 
 \indexlibrarymember{operator[]}{basic_string_view}%
 \begin{itemdecl}
-constexpr const_reference operator[](size_type pos) const;
+constexpr const char& operator[](size_type pos) const;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -1057,7 +1057,7 @@
 
 \indexlibrarymember{at}{basic_string_view}%
 \begin{itemdecl}
-constexpr const_reference at(size_type pos) const;
+constexpr const char& at(size_type pos) const;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -1072,7 +1072,7 @@
 
 \indexlibrarymember{front}{basic_string_view}%
 \begin{itemdecl}
-constexpr const_reference front() const;
+constexpr const char& front() const;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -1091,7 +1091,7 @@
 
 \indexlibrarymember{back}{basic_string_view}%
 \begin{itemdecl}
-constexpr const_reference back() const;
+constexpr const char& back() const;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -1110,7 +1110,7 @@
 
 \indexlibrarymember{data}{basic_string_view}%
 \begin{itemdecl}
-constexpr const_pointer data() const noexcept;
+constexpr const char* data() const noexcept;
 \end{itemdecl}
 
 \begin{itemdescr}