Difference between revisions of "cpp/string/basic string view/starts with"
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< cpp | string | basic string view
m (restore (1)) |
m (returns an expression) |
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Checks if the string view begins with the given prefix, where | Checks if the string view begins with the given prefix, where | ||
| − | @1@ the prefix is a string view. Effectively returns {{c|1=size() >= x.size() && compare(0, x.size(), x) == 0 | + | @1@ the prefix is a string view. Effectively returns {{c|1=size() >= x.size() && compare(0, x.size(), x) == 0}} |
| − | @2@ the prefix is a single character. Effectively returns {{c|1=!empty() && Traits::eq(front(), x) | + | @2@ the prefix is a single character. Effectively returns {{c|1=!empty() && Traits::eq(front(), x)}} |
| − | @3@ the prefix is a C-style string. Effectively returns {{c|1=starts_with(basic_string_view(x)) | + | @3@ the prefix is a C-style string. Effectively returns {{c|1=starts_with(basic_string_view(x))}} |
===Parameters=== | ===Parameters=== | ||
Revision as of 04:29, 21 May 2019
| constexpr bool starts_with(basic_string_view x) const noexcept; |
(1) | (since C++20) |
| constexpr bool starts_with(CharT x) const noexcept; |
(2) | (since C++20) |
| constexpr bool starts_with(const CharT* x) const; |
(3) | (since C++20) |
Checks if the string view begins with the given prefix, where
1) the prefix is a string view. Effectively returns size() >= x.size() && compare(0, x.size(), x) == 0
2) the prefix is a single character. Effectively returns !empty() && Traits::eq(front(), x)
3) the prefix is a C-style string. Effectively returns starts_with(basic_string_view(x))
Contents |
Parameters
| x | - | a character sequence or a single character to compare to the start of the string view |
Return value
true if the string view begins with the provided prefix, false otherwise.
Example
| This section is incomplete Reason: no example |
See also
| (C++20) |
checks if the string view ends with the given suffix (public member function) |
| (C++20) |
checks if the string starts with the given prefix (public member function of std::basic_string<CharT,Traits,Allocator>)
|
| (C++20) |
checks if the string ends with the given suffix (public member function of std::basic_string<CharT,Traits,Allocator>)
|
| compares two views (public member function) |
