| Front Page / Algorithms / Querying Algorithms / equal | 
template<
      typename Seq1
    , typename Seq2
    , typename Pred = is_same<_1,_2>
    >
struct equal
{
    typedef unspecified type;
};
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: | c::value == true is and only if size<s1>::value == size<s2>::value and for every iterator i in [begin<s1>::type, end<s1>::type) deref<i>::type is identical to 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> ));