std::basic_string_view<CharT,Traits>::starts_with
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))
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
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) |
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