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vector

Description

vector is a variadic, random access, extensible sequence of types that supports constant-time insertion and removal of elements at both ends, and linear-time insertion and removal of elements in the middle. On compilers that support the typeof extension, vector is the simplest and in many cases the most efficient sequence.

Model of

Expression semantics

In the following table, v is an instance of vector, pos and last are iterators into v, r is a Forward Sequence, n is an Integral Constant, and x and t1,t2,... tn are arbitrary types.

Expression Semantics
vector<t1,t2,... tn>
vectorn<t1,t2,... tn>
vector of elements t1,t2,... tn; see Variadic Sequence.
vector<t1,t2,... tn>::type
vectorn<t1,t2,... tn>::type
Identical to vectorn<t1,t2,... tn>; see Variadic Sequence.
begin<v>::type An iterator pointing to the beginning of v; see Random Access Sequence.
end<v>::type An iterator pointing to the end of v; see Random Access Sequence.
size<v>::type The size of v; see Random Access Sequence.
empty<v>::type A boolean Integral Constant c such that c::value == true if and only if the sequence is empty; see Random Access Sequence.
front<v>::type The first element in v; see Random Access Sequence.
back<v>::type The last element in v; see Random Access Sequence.
at<v,n>::type The nth element from the beginning of v; see Random Access Sequence.
insert<v,pos,x>::type A new vector of following elements: [begin<v>::type, pos), x, [pos, end<v>::type); see Extensible Sequence.
insert_range<v,pos,r>::type A new vector of following elements: [begin<v>::type, pos), [begin<r>::type, end<r>::type) [pos, end<v>::type); see Extensible Sequence.
erase<v,pos>::type A new vector of following elements: [begin<v>::type, pos), [next<pos>::type, end<v>::type); see Extensible Sequence.
erase<v,pos,last>::type A new vector of following elements: [begin<v>::type, pos), [last, end<v>::type); see Extensible Sequence.
clear<v>::type An empty vector; see Extensible Sequence.
push_back<v,x>::type A new vector of following elements: [begin<v>::type, end<v>::type), x; see Back Extensible Sequence.
pop_back<v>::type A new vector of following elements: [begin<v>::type, prior< end<v>::type >::type); see Back Extensible Sequence.
push_front<v,x>::type A new vector of following elements: x, [begin<v>::type, end<v>::type); see Front Extensible Sequence.
pop_front<v>::type A new vector of following elements: [next< begin<v>::type >::type, end<v>::type); see Front Extensible Sequence.

Example

typedef vector<float,double,long double> floats;
typedef push_back<floats,int>::type types;

BOOST_MPL_ASSERT(( is_same< at_c<types,3>::type, int > ));

See also

Sequences, Variadic Sequence, Random Access Sequence, Extensible Sequence, vector_c, list