find_first_not_of() [3/8]

template<typename _CharT, typename _Traits, typename _Alloc>

basic_string< _CharT, _Traits, _Alloc >::size_type std::basic_string< _CharT, _Traits, _Alloc >::find_first_not_of ( const _CharT * __s, size_type __pos, size_type __n ) const

nodiscardconstexprnoexcept

Find position of a character not in C substring.

Parameters

__s	C string containing characters to avoid.
__pos	Index of character to search from.
__n	Number of characters from __s to consider.

Returns

Index of first occurrence.

Starting from __pos, searches forward for a character not contained in the first __n characters of __s within this string. If found, returns the index where it was found. If not found, returns npos.

Definition at line 826 of file basic_string.tcc.

    {
      __glibcxx_requires_string_len(__s, __n);
      for (; __pos < this->size(); ++__pos)
      if (!traits_type::find(__s, __n, _M_data()[__pos]))
        return __pos;
      return npos;
    }

References basic_string(), __glibcxx_requires_string_len, _M_data(), npos, and size().

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