std::basic_string_view<CharT,Traits>::find_first_not_of

Since C++17

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

# Declarations

constexpr size_type
find_first_not_of( basic_string_view v, size_type pos = 0 ) const noexcept;

(since C++17)

constexpr size_type
find_first_not_of( CharT ch, size_type pos = 0 ) const noexcept;

(since C++17)

constexpr size_type
find_first_not_of( const CharT* s, size_type pos, size_type count ) const;

(since C++17)

constexpr size_type
find_first_not_of( const CharT* s, size_type pos = 0 ) const;

(since C++17)

# Parameters

# 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.

# Example

#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