cpp/string/basic string view/contains - Revision history

Space Mission: /* Example */ simplify.

2023-06-13T22:31:50Z

Example: simplify.

← Older revision		Revision as of 22:31, 13 June 2023
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	===Example===		===Example===
	{{example\|		{{example
	\|code=		\|code=
	~~#include <iostream>~~
	#include <string_view>		#include <string_view>
			using namespace std::literals;

	~~int main~~()		static_assert
	{		(
	~~using namespace std~~:~~:literals;~~		// bool contains(basic_string_view x) const noexcept;
			"https://cppreference.com"sv.contains("cpp"sv) == true and
			"https://cppreference.com"sv.contains("php"sv) == false and

	~~std::cout~~		// bool contains(CharT x) const noexcept;
	~~<< std::boolalpha~~		"C++23"sv.contains('+') == true and
			"C++23"sv.contains('-') == false and

	// bool contains(~~basic_string_view~~ x) const ~~noexcept~~;		// bool contains(const CharT* x) const;
	<< "~~https://cppreference.com~~"sv.contains("~~cpp~~"sv) ~~<< ' ' //~~ true		std::string_view("basic_string_view").contains("string") == true and
	<< "~~https://cppreference.com~~"sv.contains("~~java~~"sv) ~~<< ' ' //~~ false		std::string_view("basic_string_view").contains("String") == false
			);

	~~// bool contains~~(~~CharT x~~) ~~const noexcept;~~		int main() {}
	~~<< "C++23"sv.contains('+') << ' ' // true~~
	~~<< "C++23"sv.contains('-') << ' ' // false~~

	~~// bool contains(const CharT* x) const;~~
	~~<< std::string_view("basic_string_view").contains("string") << ' ' // true~~
	~~<< std::string_view("basic_string_view").contains("String") << '\n'; // false~~
	}
	~~\|output=~~
	~~true false true false true false~~
	}}		}}

Andreas Krug: auto main() -> int -> int main()

2023-06-04T07:40:18Z

auto main() -> int -> int main()

← Older revision		Revision as of 07:40, 4 June 2023
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	{{cpp/string/basic_string_view/title \| contains}}		{{cpp/string/basic_string_view/title\|contains}}
	{{cpp/string/basic_string_view/navbar}}		{{cpp/string/basic_string_view/navbar}}
	{{dcl begin}}		{{dcl begin}}
	{{dcl \| num=1 \|since=c++23\|1=		{{dcl\|num=1\|since=c++23\|1=
	constexpr bool contains( basic_string_view sv ) const noexcept;		constexpr bool contains( basic_string_view sv ) const noexcept;
	}}		}}
	{{dcl \| num=2 \|since=c++23\|1=		{{dcl\|num=2\|since=c++23\|1=
	constexpr bool contains( CharT c ) const noexcept;		constexpr bool contains( CharT c ) const noexcept;
	}}		}}
	{{dcl \| num=3 \|since=c++23\|1=		{{dcl\|num=3\|since=c++23\|1=
	constexpr bool contains( const CharT* s ) const;		constexpr bool contains( const CharT* s ) const;
	}}		}}
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	===Parameters===		===Parameters===
	{{par begin}}		{{par begin}}
	{{par \| sv \| a string view}}		{{par\|sv\|a string view}}
	{{par \| c \| a single character}}		{{par\|c\|a single character}}
	{{par \| s \| a null-terminated character string}}		{{par\|s\|a null-terminated character string}}
	{{par end}}		{{par end}}

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	===Example===		===Example===
	{{example \|		{{example\|
	\| code=		\|code=
	#include <iostream>		#include <iostream>
	#include <string_view>		#include <string_view>

	~~auto~~ main() ~~-> int~~		int main()
	{		{
	using namespace std::literals;		using namespace std::literals;
Line 55:		Line 55:

	// bool contains(const CharT* x) const;		// bool contains(const CharT* x) const;
	<< std::string_view("basic_string_view").contains("string") << ' ' // true		<< std::string_view("basic_string_view").contains("string") << ' ' // true
	<< std::string_view("basic_string_view").contains("String") << ' ' // false		<< std::string_view("basic_string_view").contains("String") << '\n'; // false
	~~<< '\n';~~
	}		}
	\| output=		\|output=
	true false true false true false		true false true false true false
	}}		}}
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	===See also===		===See also===
	{{dsc begin}}		{{dsc begin}}
	{{dsc inc \| cpp/string/basic_string_view/dsc starts_with}}		{{dsc inc\|cpp/string/basic_string_view/dsc starts_with}}
	{{dsc inc \| cpp/string/basic_string_view/dsc ends_with}}		{{dsc inc\|cpp/string/basic_string_view/dsc ends_with}}
	{{dsc inc \| cpp/string/basic_string_view/dsc find}}		{{dsc inc\|cpp/string/basic_string_view/dsc find}}
	{{dsc inc \| cpp/string/basic_string_view/dsc substr}}		{{dsc inc\|cpp/string/basic_string_view/dsc substr}}
	{{dsc inc \| cpp/string/basic_string/dsc {{SUBPAGENAMEE}}}}		{{dsc inc\|cpp/string/basic_string/dsc {{SUBPAGENAMEE}}}}
	{{dsc end}}		{{dsc end}}

	{{langlinks\|de\|es\|fr\|it\|ja\|pl\|pt\|ru\|zh}}		{{langlinks\|de\|es\|fr\|it\|ja\|pl\|pt\|ru\|zh}}

Space Mission: /* Notes */ +s

2022-11-14T18:26:11Z

Notes: +s

← Older revision		Revision as of 18:26, 14 November 2022
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	===Notes===		===Notes===
	{{feature test macro\|__cpp_lib_string_contains\|{{tt\|contains}} ~~function~~\|std=C++23\|value=202011L}}		{{feature test macro\|__cpp_lib_string_contains\|{{tt\|contains}} functions\|std=C++23\|value=202011L}}

	===Example===		===Example===

Space Mission: /* Notes */ ~FTM

2022-11-14T17:52:49Z

Notes: ~FTM

← Older revision		Revision as of 17:52, 14 November 2022
Line 31:		Line 31:

	===Notes===		===Notes===
	{{feature test macro\|__cpp_lib_string_contains}}		{{feature test macro\|__cpp_lib_string_contains\|{{tt\|contains}} function\|std=C++23\|value=202011L}}

	===Example===		===Example===

Space Mission: /* Notes */ + {{feature test macro}}

2022-01-28T17:42:22Z

Notes: + {{feature test macro}}

← Older revision		Revision as of 17:42, 28 January 2022
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	===Return value===		===Return value===
	{{c\|true}} if the string view contains the provided substring, {{c\|false}} otherwise.		{{c\|true}} if the string view contains the provided substring, {{c\|false}} otherwise.

			===Notes===
			{{feature test macro\|__cpp_lib_string_contains}}

	===Example===		===Example===

Space Mission: /* See also */ ++

2021-05-04T11:28:12Z

Fruderica: copy pasta

2020-11-15T08:28:45Z

copy pasta

← Older revision		Revision as of 08:28, 15 November 2020
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	{{dcl end}}		{{dcl end}}

	Checks if the string view ~~begins with~~ the given substring, where		Checks if the string view contains the given substring, where
	@1@ the substring is a string view.		@1@ the substring is a string view.
	@2@ the substring is a single character.		@2@ the substring is a single character.
Line 28:		Line 28:

	===Return value===		===Return value===
	{{c\|true}} if the string view ~~begins with~~ the provided substring, {{c\|false}} otherwise.		{{c\|true}} if the string view contains the provided substring, {{c\|false}} otherwise.

	===Example===		===Example===

Fruderica: P1679R3

2020-11-15T08:24:55Z

P1679R3

New page

{{cpp/string/basic_string_view/title | contains}}
{{cpp/string/basic_string_view/navbar}}
{{dcl begin}}
{{dcl | num=1 |since=c++23|1=
constexpr bool contains( basic_string_view sv ) const noexcept;
}}
{{dcl | num=2 |since=c++23|1=
constexpr bool contains( CharT c ) const noexcept;
}}
{{dcl | num=3 |since=c++23|1=
constexpr bool contains( const CharT* s ) const;
}}
{{dcl end}}

Checks if the string view begins with the given substring, where
@1@ the substring is a string view.
@2@ the substring is a single character.
@3@ the substring is a null-terminated character string.

All three overloads are equivalent to {{c|1=return find(x) != npos;}}, where {{tt|x}} is the parameter.

===Parameters===
{{par begin}}
{{par | sv | a string view}}
{{par | c | a single character}}
{{par | s | a null-terminated character string}}
{{par end}}

===Return value===
{{c|true}} if the string view begins with the provided substring, {{c|false}} otherwise.

===Example===
{{example |
| code=
#include <iostream>
#include <string_view>

auto main() -> int
{
using namespace std::literals;

std::cout
<< std::boolalpha

// bool contains(basic_string_view x) const noexcept;
<< "https://cppreference.com"sv.contains("cpp"sv) << ' ' // true
<< "https://cppreference.com"sv.contains("java"sv) << ' ' // false

// bool contains(CharT x) const noexcept;
<< "C++23"sv.contains('+') << ' ' // true
<< "C++23"sv.contains('-') << ' ' // false

// bool contains(const CharT* x) const;
<< std::string_view("basic_string_view").contains("string") << ' ' // true
<< std::string_view("basic_string_view").contains("String") << ' ' // false
<< '\n';
}
| output=
true false true false true false
}}

===See also===
{{dsc begin}}
{{dsc inc | cpp/string/basic_string_view/dsc starts_with}}
{{dsc inc | cpp/string/basic_string_view/dsc ends_with}}
{{dsc inc | cpp/string/basic_string_view/dsc find}}
{{dsc inc | cpp/string/basic_string_view/dsc substr}}
{{dsc end}}

{{langlinks|de|es|fr|it|ja|pl|pt|ru|zh}}

← Older revision		Revision as of 11:28, 4 May 2021
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	{{dsc inc \| cpp/string/basic_string_view/dsc find}}		{{dsc inc \| cpp/string/basic_string_view/dsc find}}
	{{dsc inc \| cpp/string/basic_string_view/dsc substr}}		{{dsc inc \| cpp/string/basic_string_view/dsc substr}}
			{{dsc inc \| cpp/string/basic_string/dsc {{SUBPAGENAMEE}}}}
	{{dsc end}}		{{dsc end}}

	{{langlinks\|de\|es\|fr\|it\|ja\|pl\|pt\|ru\|zh}}		{{langlinks\|de\|es\|fr\|it\|ja\|pl\|pt\|ru\|zh}}