P3044R2 sub-string_view from string

Author: jensmaurer

source/strings.tex

@@ -678,6 +678,8 @@
 
     constexpr basic_string_view substr(size_type pos = 0,
                                        size_type n = npos) const;       // freestanding-deleted
+    constexpr basic_string_view subview(size_type pos = 0,
+                                        size_type n = npos) const;      // freestanding-deleted
 
     constexpr int compare(basic_string_view s) const noexcept;
     constexpr int compare(size_type pos1, size_type n1,
@@ -1200,8 +1202,10 @@
 \end{itemdescr}
 
 \indexlibrarymember{substr}{basic_string_view}%
+\indexlibrarymember{subview}{basic_string_view}%
 \begin{itemdecl}
 constexpr basic_string_view substr(size_type pos = 0, size_type n = npos) const;
+constexpr basic_string_view subview(size_type pos = 0, size_type n = npos) const;
 \end{itemdecl}
 
 \begin{itemdescr}
@@ -2285,6 +2289,8 @@
 
     constexpr basic_string substr(size_type pos = 0, size_type n = npos) const &;
     constexpr basic_string substr(size_type pos = 0, size_type n = npos) &&;
+    constexpr basic_string_view<charT, traits> subview(size_type pos = 0,
+                                                       size_type n = npos) const;
 
     template<class T>
       constexpr int compare(const T& t) const noexcept(@\seebelow@);
@@ -4470,6 +4476,17 @@
 Equivalent to: \tcode{return basic_string(std::move(*this), pos, n);}
 \end{itemdescr}
 
+\indexlibrarymember{subview}{basic_string}%
+\begin{itemdecl}
+constexpr basic_string_view<charT, traits> subview(size_type pos = 0, size_type n = npos) const;
+\end{itemdecl}
+
+\begin{itemdescr}
+\pnum
+\effects
+Equivalent to: \tcode{return basic_string_view<charT, traits>(*this).subview(pos, n);}
+\end{itemdescr}
+
 \rSec4[string.compare]{\tcode{basic_string::compare}}
 
 \indexlibrarymember{compare}{basic_string}%

source/support.tex

@@ -837,6 +837,7 @@
 #define @\defnlibxname{cpp_lib_stdatomic_h}@                       202011L // also in \libheader{stdatomic.h}
 #define @\defnlibxname{cpp_lib_string_contains}@                   202011L // also in \libheader{string}, \libheader{string_view}
 #define @\defnlibxname{cpp_lib_string_resize_and_overwrite}@       202110L // also in \libheader{string}
+#define @\defnlibxname{cpp_lib_string_subview}@                    202506L // also in \libheader{string}, \libheader{string_view}
 #define @\defnlibxname{cpp_lib_string_udls}@                       201304L // also in \libheader{string}
 #define @\defnlibxname{cpp_lib_string_view}@                       202403L // also in \libheader{string}, \libheader{string_view}
 #define @\defnlibxname{cpp_lib_submdspan}@                         202411L // freestanding, also in \libheader{mdspan}