SmallVectorImpl is a class template defined in the LLVM library that provides a simple vector container with a fixed capacity. It is designed to be more efficient than std::vector for small vectors that don't need to grow dynamically.
SmallVectorImpl provides a number of methods that are similar to std::vector, such as push_back, pop_back, and size. However, it also provides methods for directly accessing the raw array of elements, as well as the capacity of the vector.
Here is an example of using SmallVectorImpl to create a vector of integers with a capacity of 4:
```C++
#include "llvm/ADT/SmallVector.h"
#include
int main() {
llvm::SmallVectorImpl v(4);
v.push_back(1);
v.push_back(2);
v.push_back(3);
v.push_back(4);
std::cout << "Size : " << v.size() << std::endl;
std::cout << "Capacity : " << v.capacity() << std::endl;
for (int i : v) {
std::cout << i << " ";
}
std::cout << std::endl;
return 0;
}
```
In this example, we create a SmallVectorImpl object with an initial capacity of 4, and then add four integers to the vector using the push_back method. We then print out the size and capacity of the vector, as well as its contents using a range-based for loop.
Overall, SmallVectorImpl is a useful utility class for efficiently storing and manipulating small vectors of objects in C++ programs. It is part of the LLVM library, which is an open-source project that provides a collection of modular and reusable components for compiler construction, optimization, and analysis.
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