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source: downloads/boost_1_33_1/libs/mpl/doc/src/refmanual/equal.rst @ 12

Last change on this file since 12 was 12, checked in by landauf, 18 years ago

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equal

Synopsis

template<
      typename Seq1
    , typename Seq2
    , typename Pred = is_same<_1,_2>
    >
struct equal
{
    typedef |unspecified| type;
};

Description

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

Parameters

Parameter Requirement Description
Seq1, Seq2 |Forward Sequence| Sequences to compare.
Pred Binary |Lambda Expression| A comparison criterion.

Expression semantics

For any |Forward Sequence|s s1 and s2 and a binary |Lambda Expression| pred:

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

|Integral Constant|
Semantics:

c::value == true is and only if size<s1>::value == size<s2>::value and for every iterator i in |begin/end<s1>| deref<i>::type is identical to

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

Complexity

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

Example

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

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