Permuting

bool next_permutation(b,b)

bool next_permutation

(b,b,bpred)

Change a range of values to the next lexicographic permutation of those values, and return true, or false if no next permuation exists.

bool prev_permutation (b,b)

bool prev_permutation

(b,b, bpred)

Change a range of values to the previous lexicographic permutation of those values, and return true, or return false if no previous permuation exists.

int a[] = {1,2,3};
do {
cout << a[0] << ’␣’ << a[1] << ’␣’ << a[2] << ’\n’;
} while ( std::next_permutation(a,a+3) );
1 2 3 // 1 3 2 //2 1 3
2 3 1 //3 1 2 //3 2 1

1.5.3.12 Permuting