33-tuple_variant.cpp

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#include <tpf_output.hpp>
 
namespace types = tpf::types;
tpf::sstream stream;
auto endl = tpf::endl;
 
void test_tuple_of_variants()
{
    using name_t = std::string;
    using age_t = int;
    using weight_t = double;
 
    using name_age_vt_t = std::variant<name_t, age_t>;
    using age_weight_vt_t = std::variant<age_t, weight_t>;
 
    // tuple of variants
    using tuple_t = std::tuple<name_age_vt_t, age_weight_vt_t>;
 
    tuple_t tpl { name_age_vt_t{ "Sophie Turner" },  age_weight_vt_t{ 22.0 / 7.0 } };
 
    stream << "tpl = " << tpl << endl;
 
    auto& name_age = std::get<name_age_vt_t>(tpl);
 
    name_age = 30;
 
    stream << "tpl = " << tpl << endl;
}
 
void test_variant_of_tuples()
{
    using name_t = std::string;
    using age_t = int;
    using weight_t = double;
 
    using name_age_tpl_t = std::tuple<name_t, age_t>;
    using age_weight_tpl_t = std::tuple<age_t, weight_t>;
 
    // a variant of tuples
    using variant_t = std::variant<name_age_tpl_t, age_weight_tpl_t>;
 
    variant_t vt { name_age_tpl_t{"Sophie", 20 } };
 
    stream << "vt = " << vt << endl;
 
    vt = age_weight_tpl_t{40, 45.6 };
 
    stream << "vt = " << vt << endl;
}
 
int main()
{
    // test_tuple_of_variants();
 
    test_variant_of_tuples();
 
}