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template<typename T, unsigned N = 2>
tf::SmallVector class

class to define a vector optimized for small array

Template parameters
T | data type
N | threshold of the number of elements in the initial storage

The class defines a C++ STL-styled vector (a variable-sized array) optimized for the case when the array is small. It contains some number of elements in-place, which allows it to avoid heap allocation when the actual number of elements is below that threshold. This allows normal small cases to be fast without losing generality for large inputs. All the methods in std::vector can apply to this class.

The class is stripped from the LLVM codebase.

## Constructors, destructors, conversion operators

SmallVector()
  constructs an empty vector
SmallVector(size_t Size, const T& Value = T()) explicit
  constructs a vector with `Size` copies of elements with value `value`
template<typename ItTy>
SmallVector(ItTy S, ItTy E)
  constructs a vector with the contents of the range `[S, E)`
SmallVector(std::initializer_list<T> IL)
  constructs a vector with the contents of the initializer list `IL`
SmallVector(const SmallVector& RHS)
  constructs the vector with the copy of the contents of `RHS`
SmallVector(SmallVector&& RHS)
  constructs the vector with the contents of `RHS` using move semantics
SmallVector(SmallVectorImpl<T>&& RHS)
  constructs a vector with the contents of `RHS` using move semantics

## Public functions

auto operator=(const SmallVector& RHS) -> const SmallVector&
  replaces the contents with a copy of the contents of `RHS`
auto operator=(SmallVector&& RHS) -> const SmallVector&
  replaces the contents with the contents of `RHS` using move semantics
auto operator=(SmallVectorImpl<T>&& RHS) -> const SmallVector&
  replaces the contents with the contents of `RHS` using move semantics
auto operator=(std::initializer_list<T> IL) -> const SmallVector&
  replaces the contents with the copy of the contents of an initializer list `IL`

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