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test_visit_struct_boost_fusion.cpp
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#include <visit_struct/visit_struct_boost_fusion.hpp>
#include <cassert>
#include <iostream>
#include <string>
#include <utility>
#include <vector>
/***
* Test structures
*/
BOOST_FUSION_DEFINE_STRUCT((dummy), test_struct_one,
(int, a)
(float, b)
(std::string, c))
using dummy::test_struct_one;
static_assert(visit_struct::traits::is_visitable<test_struct_one>::value, "WTF");
static_assert(visit_struct::field_count<test_struct_one>() == 3, "");
struct test_struct_two {
bool b;
int i;
double d;
std::string s;
};
// BOOST_FUSION_ADAPT_STRUCT(test_struct_two, d, i, b)
BOOST_FUSION_ADAPT_STRUCT(test_struct_two,
(double, d)
(int, i)
(bool, b))
static_assert(visit_struct::traits::is_visitable<test_struct_two>::value, "WTF");
static_assert(visit_struct::field_count<test_struct_two>() == 3, "");
/***
* Test visitors
*/
using spair = std::pair<std::string, std::string>;
struct test_visitor_one {
std::vector<spair> result;
void operator()(const char * name, const std::string & s) {
result.emplace_back(spair{std::string{name}, s});
}
template <typename T>
void operator()(const char * name, const T & t) {
result.emplace_back(spair{std::string{name}, std::to_string(t)});
}
};
using ppair = std::pair<const char * , const void *>;
struct test_visitor_two {
std::vector<ppair> result;
template <typename T>
void operator()(const char * name, const T & t) {
result.emplace_back(ppair{name, static_cast<const void *>(&t)});
}
};
struct test_visitor_three {
int result = 0;
template <typename T>
void operator()(const char *, T &&) {}
void operator()(const char *, int &) {
result = 1;
}
void operator()(const char *, const int &) {
result = 2;
}
void operator()(const char *, int &&) {
result = 3;
}
// Make it non-copyable and non-moveable, apply visitor should still work.
test_visitor_three() = default;
test_visitor_three(const test_visitor_three &) = delete;
test_visitor_three(test_visitor_three &&) = delete;
};
// visitation without instance
struct test_visitor_type {
std::vector<spair> result;
void operator()(const char* name, visit_struct::type_c<int>) {
result.emplace_back(spair{std::string{name}, "int"});
}
void operator()(const char* name, visit_struct::type_c<float>) {
result.emplace_back(spair{std::string{name}, "float"});
}
void operator()(const char* name, visit_struct::type_c<double>) {
result.emplace_back(spair{std::string{name}, "double"});
}
void operator()(const char* name, visit_struct::type_c<std::string>) {
result.emplace_back(spair{std::string{name}, "std::string"});
}
void operator()(const char* name, visit_struct::type_c<bool>) {
result.emplace_back(spair{std::string{name}, "bool"});
}
};
// debug_print
struct debug_printer {
template <typename T>
void operator()(const char * name, const T & t) const {
std::cout << " " << name << ": " << t << std::endl;
}
};
template <typename T>
void debug_print(const T & t) {
std::cout << "{\n";
visit_struct::apply_visitor(debug_printer{}, t);
std::cout << "}" << std::endl;
}
/***
* tests
*/
static_assert(std::is_same<decltype(visit_struct::get<0>(std::declval<test_struct_one>())), int &&>::value, "");
static_assert(std::is_same<decltype(visit_struct::get<1>(std::declval<test_struct_one>())), float &&>::value, "");
static_assert(std::is_same<decltype(visit_struct::get<2>(std::declval<test_struct_one>())), std::string &&>::value, "");
static_assert(std::is_same<decltype(visit_struct::get_name<0, test_struct_one>()), const char *>::value, "");
static_assert(std::is_same<decltype(visit_struct::get_name<1, test_struct_one>()), const char *>::value, "");
static_assert(std::is_same<decltype(visit_struct::get_name<2, test_struct_one>()), const char *>::value, "");
static_assert(std::is_same<decltype(visit_struct::get<0>(std::declval<test_struct_two>())), double &&>::value, "");
static_assert(std::is_same<decltype(visit_struct::get<1>(std::declval<test_struct_two>())), int &&>::value, "");
static_assert(std::is_same<decltype(visit_struct::get<2>(std::declval<test_struct_two>())), bool &&>::value, "");
#include <boost/version.hpp>
int main() {
std::cout << __FILE__ << std::endl;
std::cout << "Boost version: "<< BOOST_LIB_VERSION << std::endl;
{
test_struct_one s{ 5, 7.5f, "asdf" };
debug_print(s);
assert(visit_struct::get<0>(s) == 5);
assert(visit_struct::get<1>(s) == 7.5f);
assert(visit_struct::get<2>(s) == "asdf");
assert(visit_struct::get_name<0>(s) == std::string{"a"});
assert(visit_struct::get_name<1>(s) == std::string{"b"});
assert(visit_struct::get_name<2>(s) == std::string{"c"});
assert(visit_struct::get_accessor<0>(s)(s) == visit_struct::get<0>(s));
assert(visit_struct::get_accessor<1>(s)(s) == visit_struct::get<1>(s));
assert(visit_struct::get_accessor<2>(s)(s) == visit_struct::get<2>(s));
test_visitor_one vis1;
visit_struct::apply_visitor(vis1, s);
assert(vis1.result.size() == 3);
assert(vis1.result[0].first == "a");
assert(vis1.result[0].second == "5");
assert(vis1.result[1].first == "b");
assert(vis1.result[1].second == "7.500000");
assert(vis1.result[2].first == "c");
assert(vis1.result[2].second == "asdf");
test_visitor_two vis2;
visit_struct::apply_visitor(vis2, s);
assert(vis2.result.size() == 3);
assert(vis2.result[0].second == &s.a);
assert(vis2.result[1].second == &s.b);
assert(vis2.result[2].second == &s.c);
test_struct_one t{ 0, 0.0f, "jkl" };
debug_print(t);
test_visitor_one vis3;
visit_struct::apply_visitor(vis3, t);
assert(vis3.result.size() == 3);
assert(vis3.result[0].first == "a");
assert(vis3.result[0].second == "0");
assert(vis3.result[1].first == "b");
assert(vis3.result[1].second == "0.000000");
assert(vis3.result[2].first == "c");
assert(vis3.result[2].second == "jkl");
test_visitor_two vis4;
visit_struct::apply_visitor(vis4, t);
assert(vis4.result.size() == 3);
assert(vis4.result[0].first == vis2.result[0].first);
assert(vis4.result[0].second == &t.a);
assert(vis4.result[1].first == vis2.result[1].first);
assert(vis4.result[1].second == &t.b);
assert(vis4.result[2].first == vis2.result[2].first);
assert(vis4.result[2].second == &t.c);
}
{
test_struct_two s{ false, 5, -1.0, "foo" };
debug_print(s);
test_visitor_one vis1;
visit_struct::apply_visitor(vis1, s);
assert(vis1.result.size() == 3);
assert(vis1.result[0].first == std::string{"d"});
assert(vis1.result[0].second == "-1.000000");
assert(vis1.result[1].first == std::string{"i"});
assert(vis1.result[1].second == "5");
assert(vis1.result[2].first == std::string{"b"});
assert(vis1.result[2].second == "0");
test_visitor_two vis2;
visit_struct::apply_visitor(vis2, s);
assert(vis2.result.size() == 3);
assert(vis2.result[0].second == &s.d);
assert(vis2.result[1].second == &s.i);
assert(vis2.result[2].second == &s.b);
test_struct_two t{ true, -14, .75, "bar" };
debug_print(t);
test_visitor_one vis3;
visit_struct::apply_visitor(vis3, t);
assert(vis3.result.size() == 3);
assert(vis3.result[0].first == std::string{"d"});
assert(vis3.result[0].second == "0.750000");
assert(vis3.result[1].first == std::string{"i"});
assert(vis3.result[1].second == "-14");
assert(vis3.result[2].first == std::string{"b"});
assert(vis3.result[2].second == "1");
test_visitor_two vis4;
visit_struct::apply_visitor(vis4, t);
assert(vis4.result.size() == 3);
assert(vis4.result[0].first == vis2.result[0].first);
assert(vis4.result[0].second == &t.d);
assert(vis4.result[1].first == vis2.result[1].first);
assert(vis4.result[1].second == &t.i);
assert(vis4.result[2].first == vis2.result[2].first);
assert(vis4.result[2].second == &t.b);
}
// Test move semantics
{
test_struct_one s{0, 0, ""};
test_visitor_three vis;
visit_struct::apply_visitor(vis, s);
assert(vis.result == 1);
const auto & ref = s;
visit_struct::apply_visitor(vis, ref);
assert(vis.result == 2);
visit_struct::apply_visitor(vis, std::move(s));
assert(vis.result == 3);
}
// Test visitation without instance
{
test_visitor_type vis;
visit_struct::visit_types<dummy::test_struct_one>(vis);
assert(vis.result.size() == 3u);
assert(vis.result[0].first == "a");
assert(vis.result[0].second == "int");
assert(vis.result[1].first == "b");
assert(vis.result[1].second == "float");
assert(vis.result[2].first == "c");
assert(vis.result[2].second == "std::string");
}
{
test_visitor_type vis;
visit_struct::visit_types<test_struct_two>(vis);
assert(vis.result.size() == 3u);
assert(vis.result[0].first == "d");
assert(vis.result[0].second == "double");
assert(vis.result[1].first == "i");
assert(vis.result[1].second == "int");
assert(vis.result[2].first == "b");
assert(vis.result[2].second == "bool");
}
}