The sort function in C sorts container elements in place. It accepts a container range and an optional comparison function, and sorts in ascending order by default. Passing a custom function can sort by different rules.
Usage of sort function in C
The sort function is a powerful algorithm in the C standard library, used to Performs an in-place sorting operation on the elements in the container. It takes a container as input and rearranges the values in the container based on a specific comparison function.
Usage
The prototype of the sort function is as follows:
void sort(InputIt first, InputIt last, Compare comp = less<>());
Among them,
- first and last are iterators representing the range of containers to be sorted.
- comp is an optional comparison function used to specify the sorting order.
Sort rules
By default, the sort function uses the std::less
comparison function, which will be smaller elements are sorted before larger elements. A custom comparison function can be passed to specify different collations.
For example:
Sort number containers in descending order:
#include <vector> #include <algorithm> int main() { std::vector<int> numbers = {3, 1, 5, 2, 4}; std::sort(numbers.begin(), numbers.end(), std::greater<>{}); // 输出:{5, 4, 3, 2, 1} }
Notes
- The sort function only sorts contiguous memory areas, so the container must be a sequential container, such as array, vector, list, etc.
- The sorting algorithm is performed in-place, which means that it directly modifies the contents of the container.
- If the containers contain identical elements, the sort function rearranges them based on the behavior of the comparison function.
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