75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
#include <iostream>
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#include <vector>
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#include <thread>
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#include <string>
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#include <sstream>
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#include <utility>
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#include <type_traits>
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#include <boost/timer/timer.hpp>
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#include "variant.hpp"
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using namespace mapbox;
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namespace test {
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struct point
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{
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public:
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point (double x_, double y_)
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: x(x_), y(y_) {}
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double x;
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double y;
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};
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struct line_string : std::vector<point> {};
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struct polygon : std::vector<line_string> {};
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using variant = util::variant<std::reference_wrapper<const point>,
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std::reference_wrapper<const line_string>,
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std::reference_wrapper<const polygon>>;
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struct print
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{
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using result_type = void;
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void operator() (point const& pt) const
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{
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std::cerr << "Point(" << pt.x << "," << pt.y << ")" << std::endl;
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}
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void operator() (line_string const& line) const
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{
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std::cerr << "Line(";
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for (auto const& pt : line)
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{
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std::cerr << pt.x << " " << pt.y << ",";
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}
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std::cerr << ")" << std::endl;
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}
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template <typename T>
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void operator() (T const& val) const
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{
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std::cerr << typeid(T).name() << std::endl;
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}
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};
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}
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int main (int argc, char** argv)
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{
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std::cerr << sizeof(test::polygon) << std::endl;
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std::cerr << sizeof(test::variant) << std::endl;
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test::point pt(123,456);
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test::variant var = std::move(std::cref(pt));
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util::apply_visitor(test::print(), var);
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test::line_string line;
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line.push_back(pt);
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line.push_back(pt);
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line.push_back(test::point(999,333));
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var = std::move(std::cref(line));
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util::apply_visitor(test::print(), var);
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std::cerr << "Is line (cref) ? " << var.is<std::reference_wrapper<test::line_string const>>() << std::endl;
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auto const& line2 = var.get<test::line_string>(); // accessing underlying type of std::reference_wrapper<T>
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test::print printer;
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printer(line2);
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return EXIT_SUCCESS;
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}
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