...one of the most highly
regarded and expertly designed C++ library projects in the
world.

— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards

Front Page / Algorithms / Querying Algorithms / equal |

template< typename Seq1 , typename Seq2 , typename Pred = is_same<_1,_2> > struct equal { typedefunspecifiedtype; };

Returns a true-valued Integral Constant if the two sequences `Seq1`
and `Seq2` are identical when compared element-by-element.

#include <boost/mpl/equal.hpp>

Parameter | Requirement | Description |
---|---|---|

Seq1, Seq2 |
Forward Sequence | Sequences to compare. |

Pred |
Binary Lambda Expression | A comparison criterion. |

For any Forward Sequences `s1` and `s2` and a binary Lambda Expression `pred`:

typedef equal<s1,s2,pred>::type c;

Return type: | |
---|---|

Semantics: |
advance< begin<s2>::type, distance< begin<s1>::type,i >::type >::type |

Linear. At most `size<s1>::value` comparisons.

typedef vector<char,int,unsigned,long,unsigned long> s1; typedef list<char,int,unsigned,long,unsigned long> s2; BOOST_MPL_ASSERT(( equal<s1,s2> ));