boost algorithm

BOost Algorithm provides algorithms that complement the algorithms from the standard library. Unlike Boost Range, Boost Algorithm doesn't introduce new concepts. The algorithms defined by Boost Algorithm resemble the algorithms from the standard library.

#include <boost/algorithm/cxx11/one_of.hpp>
#include <array>
#include <iostream>

using namespace boost::algorithm;

int main() {
  std::array<int, 6> a{{0, 5, 2, 1, 4, 3}};
  atuo predicate = [](int i) { return i == 4; };
  std::cout.setf(std::ios::boolalpha);
  std::cout << one_of(a.begin(), a.end(), predicate) << std;:endl;
  std::cout << one_of_equal(a.begin(), a.end(), 4) << std::endl;
  return 0;
}

输出为：

true

true

 boost::algorithm::one_of() tests whether a condition is met exactly once. The condition to test is passed as a predicate.

Boost Algorithm also defines the following functions: boost::algorithm::all_of_equal(), boost::algorithm::any_of_equal() and boost::algorithm::none_of_equal().

Boost.Algorithm provides more algorithms from the C++11 standard library. For example, you have access to boost::algorithm::is_partitioned(), boost::algorithm::is_permutation(), boost::algorithm::copy_n(), boost::algorithm::find_if_not() and boost::algorithm::iota(). These  functions work like the indentically named functions from the C++11 standard library and are provided for developers who don't use C++11.