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LWG Poll 4: P1679R3 string contains function #4373

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Merged
merged 1 commit into from
Dec 14, 2020
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LWG Poll 4: P1679R3 string contains function #4373

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39 changes: 39 additions & 0 deletions source/strings.tex
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Original file line number Diff line number Diff line change
Expand Up @@ -1046,6 +1046,10 @@
constexpr bool ends_with(basic_string_view<charT, traits> x) const noexcept;
constexpr bool ends_with(charT x) const noexcept;
constexpr bool ends_with(const charT* x) const;

constexpr bool contains(basic_string_view<charT, traits> x) const noexcept;
constexpr bool contains(charT x) const noexcept;
constexpr bool contains(const charT* x) const;
};

template<class InputIterator,
Expand Down Expand Up @@ -3222,6 +3226,24 @@
\end{codeblock}
\end{itemdescr}

\rSec4[string.contains]{\tcode{basic_string::contains}}

\indexlibrarymember{contains}{basic_string}%
\begin{itemdecl}
constexpr bool contains(basic_string_view<charT, traits> x) const noexcept;
constexpr bool contains(charT x) const noexcept;
constexpr bool contains(const charT* x) const;
\end{itemdecl}

\begin{itemdescr}
\pnum
\effects
Equivalent to:
\begin{codeblock}
return basic_string_view<charT, traits>(data(), size()).contains(x);
\end{codeblock}
\end{itemdescr}

\rSec2[string.nonmembers]{Non-member functions}

\indexlibraryglobal{basic_string}
Expand Down Expand Up @@ -4117,6 +4139,10 @@
constexpr bool ends_with(charT x) const noexcept;
constexpr bool ends_with(const charT* x) const;

constexpr bool contains(basic_string_view x) const noexcept;
constexpr bool contains(charT x) const noexcept;
constexpr bool contains(const charT* x) const;

// \ref{string.view.find}, searching
constexpr size_type find(basic_string_view s, size_type pos = 0) const noexcept;
constexpr size_type find(charT c, size_type pos = 0) const noexcept;
Expand Down Expand Up @@ -4717,6 +4743,19 @@
Equivalent to: \tcode{return ends_with(basic_string_view(x));}
\end{itemdescr}

\indexlibrarymember{contains}{basic_string_view}%
\begin{itemdecl}
constexpr bool contains(basic_string_view x) const noexcept;
constexpr bool contains(charT x) const noexcept;
constexpr bool contains(const charT* x) const;
\end{itemdecl}

\begin{itemdescr}
\pnum
\effects
Equivalent to: \tcode{return find(x) != npos;}
\end{itemdescr}

\rSec3[string.view.find]{Searching}

\pnum
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1 change: 1 addition & 0 deletions source/support.tex
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Expand Up @@ -673,6 +673,7 @@
#define @\defnlibxname{cpp_lib_span}@ 202002L // also in \libheader{span}
#define @\defnlibxname{cpp_lib_ssize}@ 201902L // also in \libheader{iterator}
#define @\defnlibxname{cpp_lib_starts_ends_with}@ 201711L // also in \libheader{string}, \libheader{string_view}
#define @\defnlibxname{cpp_lib_string_contains}@ 202011L // also in \libheader{string}, \libheader{string_view}
#define @\defnlibxname{cpp_lib_string_udls}@ 201304L // also in \libheader{string}
#define @\defnlibxname{cpp_lib_string_view}@ 201803L // also in \libheader{string}, \libheader{string_view}
#define @\defnlibxname{cpp_lib_syncbuf}@ 201803L // also in \libheader{syncstream}
Expand Down