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 ) const (1) (since C++17)
noexcept;
constexpr size_type (2) (since C++17)
find_first_not_of( CharT c, size_type pos = 0 ) const noexcept;
constexpr size_type
find_first_not_of( const CharT* s, size_type pos, size_type count (3) (since C++17)
) 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(c), 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 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
(C++17) (public member function)
rfind find the last occurrence of a substring
(C++17) (public member function)
find_first_of find first occurrence of characters
(C++17) (public member function)
find_last_of find last occurrence of characters
(C++17) (public member function)
find_last_not_of find last absence of characters
(C++17) (public member function)
find first absence of characters
find_first_not_of (public member function of
std::basic_string<CharT,Traits,Allocator>)