NAME¶

std::basic_string_view::find_first_not_of - std::basic_string_view::find_first_not_of

Synopsis¶

constexpr size_type
find_first_not_of( basic_string_view v, size_type pos = 0 ) (1) (since C++17)
const noexcept;
constexpr size_type
find_first_not_of( CharT ch, size_type pos = 0 ) const (2) (since C++17)
noexcept;
constexpr size_type
find_first_not_of( const CharT* s, size_type pos, size_type (3) (since C++17)
count ) const;
constexpr size_type (4) (since C++17)
find_first_not_of( const CharT* s, size_type pos = 0 ) const;

Finds the first character not equal to any of the characters in the given character
sequence.

1) Finds the first character not equal to any of the characters of v in this view,
starting at position pos.
2) Equivalent to find_first_not_of(basic_string_view(std::addressof(ch), 1), pos).
3) Equivalent to find_first_not_of(basic_string_view(s, count), pos).
4) Equivalent to find_first_not_of(basic_string_view(s), pos).

Parameters¶

v - view to search for
pos - position at which to start the search
count - length of the string of characters to compare
s - pointer to a string of characters to compare
ch - character to compare

Return value¶

Position of the first character not equal to any of the characters in the given
string, or std::string_view::npos if no such character is found.

Complexity¶

O(size() * v.size()) at worst.

Example¶

// Run this code

#include <string_view>
using namespace std::literals;

int main()
{
static_assert(2 == "BCDEF"sv.find_first_not_of("ABC"));
// ^
static_assert(4 == "BCDEF"sv.find_first_not_of("ABC", 4));
// ^
static_assert(1 == "BCDEF"sv.find_first_not_of('B'));
// ^
static_assert(3 == "BCDEF"sv.find_first_not_of('D', 2));
// ^
}

See also¶

find find characters in the view
(public member function)
rfind find the last occurrence of a substring
(public member function)
find_first_of find first occurrence of characters
(public member function)
find_last_of find last occurrence of characters
(public member function)
find_last_not_of find last absence of characters
(public member function)
find first absence of characters
find_first_not_of (public member function of
std::basic_string<CharT,Traits,Allocator>)