basic_string::find_last_not_of
Searches through a string for the last character that is not any element of a specified string.
size_type find_last_not_of(
value_type _Ch,
size_type _Off = npos
) const;
size_type find_last_not_of(
const value_type* _Ptr,
size_type _Off = npos
) const;
size_type find_last_not_of(
const value_type* _Ptr,
size_type _Off,
size_type _Count
) const;
size_type find_last_not_of(
const basic_string<CharType, Traits, Allocator>& _Str,
size_type _Off = npos
) const;
Parameters
_Ch
The character value for which the member function is to search._Off
Index of the position at which the search is to finish._Ptr
The C-string for which the member function is to search._Count
The number of characters, counting forward from the first character, in the C-string for which the member function is to search._Str
The string for which the member function is to search.
Return Value
The index of the first character of the substring searched for when successful; otherwise npos.
Example
// basic_string_find_last_not_of.cpp
// compile with: /EHsc
#include <string>
#include <iostream>
int main( )
{
using namespace std;
// The first member function
// searches for a single character in a string
string str1 ( "dddd-1dd4-abdd" );
cout << "The original string str1 is: " << str1 << endl;
basic_string <char>::size_type indexCh1a, indexCh1b;
static const basic_string <char>::size_type npos = -1;
indexCh1a = str1.find_last_not_of ( "d" , 7 );
if ( indexCh1a != npos )
cout << "The index of the last non 'd'\n found before the "
<< "7th position in str1 is: " << indexCh1a << endl;
else
cout << "The non 'd' character was not found ." << endl;
indexCh1b = str1.find_last_not_of ( "d" );
if ( indexCh1b != npos )
cout << "The index of the non 'd' found in str1 is: "
<< indexCh1b << endl << endl;
else
cout << "The Character 'non x' was not found in str1."
<< endl << endl;
// The second member function searches a string
// for a substring as specified by a C-string
string str2 ( "BBB-1111" );
cout << "The original string str2 is: " << str2 << endl;
basic_string <char>::size_type indexCh2a, indexCh2b;
const char *cstr2 = "B1";
indexCh2a = str2.find_last_not_of ( cstr2 , 6 );
if ( indexCh2a != npos )
cout << "The index of the last occurrence of a "
<< "element\n not of 'B1' in str2 before the 6th "
<< "position is: " << indexCh2a << endl;
else
cout << "Elements not of the substring 'B1' were not "
<< "\n found in str2 before the 6th position."
<< endl;
const char *cstr2b = "B-1";
indexCh2b = str2.find_last_not_of ( cstr2b );
if ( indexCh2b != npos )
cout << "The index of the last element not "
<< "in 'B-1'\n is: "
<< indexCh2b << endl << endl;
else
cout << "The elements of the substring 'B-1' were "
<< "not found in str2 ."
<< endl << endl;
// The third member function searches a string
// for a substring as specified by a C-string
string str3 ( "444-555-GGG" );
cout << "The original string str3 is: " << str3 << endl;
basic_string <char>::size_type indexCh3a, indexCh3b;
const char *cstr3a = "45G";
indexCh3a = str3.find_last_not_of ( cstr3a );
if ( indexCh3a != npos )
cout << "The index of the last occurrence of an "
<< "element in str3\n other than one of the "
<< "characters in '45G' is: " << indexCh3a
<< endl;
else
cout << "Elements in str3 contain only characters "
<< " in the string '45G'. "
<< endl;
const char *cstr3b = "45G";
indexCh3b = str3.find_last_not_of ( cstr3b , 6 , indexCh3a - 1 );
if (indexCh3b != npos )
cout << "The index of the penultimate occurrence of an "
<< "element\n not in '45G' in str3 is: "
<< indexCh3b << endl << endl;
else
cout << "Elements in str3 contain only characters "
<< " in the string '45G'. "
<< endl << endl;
// The fourth member function searches a string
// for a substring as specified by a string
string str4 ( "12-ab-12-ab" );
cout << "The original string str4 is: " << str4 << endl;
basic_string <char>::size_type indexCh4a, indexCh4b;
string str4a ( "b-a" );
indexCh4a = str4.find_last_not_of ( str4a , 5 );
if ( indexCh4a != npos )
cout << "The index of the last occurrence of an "
<< "element not\n in 'b-a' in str4 before the 5th "
<< "position is: " << indexCh4a << endl;
else
cout << "Elements other than those in the substring"
<< " 'b-a' were not found in the string str4."
<< endl;
string str4b ( "12" );
indexCh4b = str4.find_last_not_of ( str4b );
if ( indexCh4b != npos )
cout << "The index of the last occurrence of an "
<< "element not in '12'\n in str4 before the end "
<< "position is: " << indexCh4b << endl;
else
cout << "Elements other than those in the substring"
<< " '12'\n were not found in the string str4."
<< endl;
}
The original string str1 is: dddd-1dd4-abdd
The index of the last non 'd'
found before the 7th position in str1 is: 5
The index of the non 'd' found in str1 is: 11
The original string str2 is: BBB-1111
The index of the last occurrence of a element
not of 'B1' in str2 before the 6th position is: 3
The elements of the substring 'B-1' were not found in str2 .
The original string str3 is: 444-555-GGG
The index of the last occurrence of an element in str3
other than one of the characters in '45G' is: 7
The index of the penultimate occurrence of an element
not in '45G' in str3 is: 3
The original string str4 is: 12-ab-12-ab
The index of the last occurrence of an element not
in 'b-a' in str4 before the 5th position is: 1
The index of the last occurrence of an element not in '12'
in str4 before the end position is: 10
Requirements
Header: <string>
Namespace: std