front

<<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working Description ======= ======= ======= ======= ======= ======= >>>>>>> .merge-right.r58559 >>>>>>> .merge-right.r58549 >>>>>>> .merge-right.r58299 >>>>>>> .merge-right.r57337 >>>>>>> .merge-right.r57242 Description >>>>>>> .merge-right.r57125

Returns the first element in the sequence.

<<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working Synopsis ======= ======= ======= ======= ======= ======= >>>>>>> .merge-right.r58559 >>>>>>> .merge-right.r58549 >>>>>>> .merge-right.r58299 >>>>>>> .merge-right.r57337 >>>>>>> .merge-right.r57242 Synopsis >>>>>>> .merge-right.r57125

template <typename Sequence>
typename result_of::front<Sequence>::type
front(Sequence& seq);

template <typename Sequence>
typename result_of::front<Sequence const>::type
front(Sequence const& seq);

<<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working Parameters ======= ======= ======= ======= ======= ======= >>>>>>> .merge-right.r58559 >>>>>>> .merge-right.r58549 >>>>>>> .merge-right.r58299 >>>>>>> .merge-right.r57337 >>>>>>> .merge-right.r57242 Parameters >>>>>>> .merge-right.r57125

Parameter	Requirement	Description
`seq`	Model of Forward Sequence	The sequence we wish to investigate.

<<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working Expression ======= ======= ======= ======= ======= ======= >>>>>>> .merge-right.r58559 >>>>>>> .merge-right.r58549 >>>>>>> .merge-right.r58299 >>>>>>> .merge-right.r57337 >>>>>>> .merge-right.r57242 Expression >>>>>>> .merge-right.r57125 Semantics

front(seq);

Return type: Returns a reference to the first element in the sequence seq if seq is mutable and e = o, where e is the first element in the sequence, is a valid expression. Else, returns a type convertable to the first element in the sequence.

Precondition: empty(seq) == false

Semantics: Returns the first element in the sequence.

<<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working Header ======= ======= ======= ======= ======= ======= >>>>>>> .merge-right.r58559 >>>>>>> .merge-right.r58549 >>>>>>> .merge-right.r58299 >>>>>>> .merge-right.r57337 >>>>>>> .merge-right.r57242 Header >>>>>>> .merge-right.r57125

#include <boost/fusion/sequence/intrinsic/front.hpp>
#include <boost/fusion/include/front.hpp>

<<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working <<<<<<< .working Example ======= ======= ======= ======= ======= ======= >>>>>>> .merge-right.r58559 >>>>>>> .merge-right.r58549 >>>>>>> .merge-right.r58299 >>>>>>> .merge-right.r57337 >>>>>>> .merge-right.r57242 Example >>>>>>> .merge-right.r57125

vector<int, int, int> v(1, 2, 3);
assert(front(v) == 1);