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<!doctype html public "-//ietf//dtd html//en">
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< html >< head >< title > boost::mpl::find</ title >
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< link rel = "stylesheet" href = "../mpl_wiki.css" >
</ head >< body bgcolor = "white" >
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< h1 >< a href = "../Table_of_Contents.html" >< img src = "../mpl_logo.jpg" alt = "[Home]" border = 0 align = "right" ></ a > find</ h1 >< h3 > Synopsis</ h3 >
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< p >
< pre >
template<
typename Sequence
, typename T
>
struct find
{
typedef < em > unspecified</ em > type;
};
</ pre >
< p >
< h3 > Description</ h3 >
< p >
Finds the first occurrence of type < code > T</ code > in a < code > Sequence</ code > .
< p >
< h3 > Definition</ h3 >
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< pre >
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#include "< a href = "../../../../../boost/mpl/find.hpp" > boost/mpl/find.hpp</ a > "
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</ pre >
< p >
< h3 > Parameters</ h3 >
< table border = "1" >
< tr >< th > Parameter </ th >< th > Requirement </ th >< th > Description </ th ></ tr >
< tr >< td >< code > Sequence</ code ></ td >< td > A model of < a href = "../Forward_Sequence.html" > Forward Sequence</ a ></ td >< td > A sequence to search in. </ td ></ tr >
< tr >< td >< code > T</ code ></ td >< td > A type</ td >< td > The type to search for. </ td ></ tr >
</ table >
< p >
< h3 > Expression semantics</ h3 >
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< table border = "1" >
< tr >< th > Expression </ th >< th > Expression type </ th >< th > Precondition </ th >< th > Semantics </ th >< th > Postcondition </ th ></ tr >
< tr >< td >< code > typedef find< Sequence,T> ::type i;</ code ></ td >< td > A model of < a href = "../Forward_Iterator.html" > Forward Iterator</ a ></ td >< td ></ td >< td > Equivalent to < code > typedef < a href = "../Reference/find_if.html" > find_if</ a > < Sequence, is_same< _,T> > ::type i</ code > ; </ td ></ tr >
</ table >
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< h3 > Complexity</ h3 >
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Linear. At most < code > size< Sequence> ::value</ code > comparisons for identity.
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< h3 > Example</ h3 >
< p >
< pre >
typedef < a href = "../Reference/vector.html" > vector</ a > < char,int,unsigned,long,unsigned long> types;
typedef find< types,unsigned> ::type iter;
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BOOST_STATIC_ASSERT(iter::pos::value == 2);
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</ pre >
< p >
< h3 > See also</ h3 >
< p >
< a href = "../Algorithms.html" > Algorithms</ a > , < code >< a href = "../Reference/find_if.html" > find_if</ a ></ code > , < code >< a href = "../Reference/contains.html" > contains</ a ></ code > , < code >< a href = "../Reference/count.html" > count</ a ></ code > , < code >< a href = "../Reference/count_if.html" > count_if</ a ></ code >
< p >< hr >
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< a href = "../Table_of_Contents.html" > Table of Contents</ a >< br > Last edited September 15, 2002 7:24 pm</ body ></ html >
