ex10_13.cpp

//! @Yue Wang
//!
//! Exercise 10.13:
//! The library defines an algorithm named partition that takes a predicate
//! and partitions the container so that values for which the predicate is
//! true appear in the first part and those for which the predicate is false
//! appear in the second part. The algorithm returns an iterator just past
//! the last element for which the predicate returned true. Write a function
//! that takes a string and returns a bool indicating whether the string has
//! five characters or more. Use that function to partition words. Print the
//! elements that have five or more characters.
//!

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

bool predicate(const std::string& s)
{
    return s.size() >= 5;
}

int main()
{
    auto v = std::vector<std::string>{"a",         "as",        "aasss",
                                      "aaaaassaa", "aaaaaabba", "aaa"};
    auto pivot = std::partition(v.begin(), v.end(), predicate);

    for (auto it = v.cbegin(); it != pivot; ++it) std::cout << *it << " ";
    std::cout << std::endl;

    return 0;
}