boost笔记4(boost::multi_array)
boost::multi_array一言以概之，boost::multi_array就是N维数组。boost::multi_array可以看作STL容器类的扩展，可以和STL相关算法一起工作。
在STL中，N维数组可以通过std::vector<std::vector<...> >类似的方法来模拟，相比而言，boost::multi_array更高效，更直观。
例程1：
#include <cassert>#include "boost/multi_array.hpp"#include "boost/cstdlib.hpp"int main () {// Create a 3D array that is 3 x 4 x 2typedef boost::multi_array<double, 3> array;array A(boost::extents);// Assign a value to an element in the arrayA = 3.14;assert(A == 3.14);return boost::exit_success;}
例程2：
#include <cassert>#include "boost/multi_array.hpp"#include "boost/array.hpp"#include "boost/cstdlib.hpp"int main () {// Create a 3D array that is 3 x 4 x 2boost::array<int, 3> shape = {{ 3, 4, 2 }};boost::multi_array<double, 3> A(shape);// Assign a value to an element in the arrayA = 3.14;assert(A == 3.14);return boost::exit_success;}
例程3：
#include <iostream>#include "boost/multi_array.hpp"#include "boost/array.hpp"#include "boost/cstdlib.hpp"template <typename Array>void print(std::ostream& os, const Array& A) {typename Array::const_iterator i;os << "[";for (i = A.begin(); i != A.end(); ++i) { print(os, *i); if (boost::next(i) != A.end()) os << ',';}os << "]";}void print(std::ostream& os, const double& x) {os << x;}int main() {typedef boost::multi_array<double, 2> array;double values[] = { 0, 1, 2, 3, 4, 5 };const int values_size = 6;array A(boost::extents);A.assign(values,values + values_size);print(std::cout, A);return boost::exit_success;}
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