valarray
class look's same to array
class, can you please explain me where would I prefer valarray
over array
or vice versa?
Difference between std::vector and std::array in C++Vector is a sequential container to store elements and not index based. Array stores a fixed-size sequential collection of elements of the same type and it is index based. Vector is dynamic in nature so, size increases with insertion of elements.
std::valarray is the class for representing and manipulating arrays of values. It supports element-wise mathematical operations and various forms of generalized subscript operators, slicing and indirect access.
Vector is better for frequent insertion and deletion, whereas Arrays are much better suited for frequent access of elements scenario. Vector occupies much more memory in exchange for managing storage and growing dynamically, whereas Arrays are a memory-efficient data structure.
An array is a data structure that stores a fixed number of elements (elements should of the same type) in sequential order. A Vector is a sequential-based container. Arrays can be implemented in a static or dynamic way. Vectors can only be implemented dynamically.
valarray
was already in C++03, array
is new in C++11valarray
is variable length, array
is not.valarray
is designed for numeric computations and provides plenty of operations including +
, -
, *
, cos
, sin
, etc... array
does not.valarray
has an interface to retrieve slices of the array (sub arrays), array
does not.valarray
is a dynamic data structure, whose size can change at runtime and which performs dynamic allocation. array
is a static data structure whose size is determined at compile time (and it is also an aggregate).
Don't use valarray
, though; just use a vector
instead.
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