libcruft-util/test/introspection.cpp

#include "introspection.hpp"
#include "std.hpp"

#include "tap.hpp"
#include <iostream>


///////////////////////////////////////////////////////////////////////////////
// simple test struct of scalars
struct foo
{
    int a;
    float b;
};


//-----------------------------------------------------------------------------
namespace bar {
    struct qux {
        short c;
    };
}


///////////////////////////////////////////////////////////////////////////////
template <typename ValueT>
struct templated_with_type { ValueT inner; };


template <int ValueV>
struct templated_with_value { };


enum enumeration_t { FOO };

template <enumeration_t EnumV>
struct templated_with_enum { };


///////////////////////////////////////////////////////////////////////////////
// define introspection data
namespace cruft
{
    template <>
    struct type<foo>
    {
        typedef std::tuple<
            field<foo,int,&foo::a>,
            field<foo,float,&foo::b>
        > fields;
    };

    template <> const std::string field<foo,int,&foo::a>::name = "a";
    template <> const std::string field<foo,float,&foo::b>::name = "b";
}


//-----------------------------------------------------------------------------
int main ()
{
    cruft::TAP::logger tap;

    // Ensure tuples are mapped to themselves with type_tuple::type
    {
        using src_t = std::tuple<int>;
        using dst_t = typename cruft::type_tuple<src_t>::type;

        tap.expect (std::is_same<src_t, dst_t>::value, "static identity type_tuple");
    }

    // Check member extraction from a simple POD structure.
    {
        foo d_foo { 7, 42.0 };
        auto f_tuple = cruft::as_tuple (d_foo);

        tap.expect (cruft::equal (d_foo.a, std::get<0> (f_tuple)) &&
                    cruft::equal (d_foo.b, std::get<1> (f_tuple)),
                    "dynamic member access after conversion to tuple");
    }

    tap.expect_eq (cruft::view (cruft::type_name<i08> ()), "i08", "i08 type_name");
    tap.expect_eq (cruft::view (cruft::type_name<i16> ()), "i16", "i16 type_name");
    tap.expect_eq (cruft::view (cruft::type_name<i32> ()), "i32", "i32 type_name");
    tap.expect_eq (cruft::view (cruft::type_name<i64> ()), "i64", "i64 type_name");

    tap.expect_eq (cruft::view (cruft::type_name<u08> ()), "u08", "u08 type_name");
    tap.expect_eq (cruft::view (cruft::type_name<u16> ()), "u16", "u16 type_name");
    tap.expect_eq (cruft::view (cruft::type_name<u32> ()), "u32", "u32 type_name");
    tap.expect_eq (cruft::view (cruft::type_name<u64> ()), "u64", "u64 type_name");

    tap.expect_eq (cruft::view (cruft::type_name<f32> ()), "f32", "f32 type_name");
    tap.expect_eq (cruft::view (cruft::type_name<f64> ()), "f64", "f64 type_name");

    tap.expect_eq (cruft::view (cruft::type_name<foo> ()), "foo", "struct type_name");
    tap.expect_eq (cruft::view (cruft::type_name<bar::qux> ()), "qux", "namespaced struct type_name");

    tap.expect_eq (
        cruft::type_name<templated_with_type<int>> (),
        std::string_view {"templated_with_type<int>"},
        "templated_with_type"
    );

    tap.expect_eq (
        cruft::type_name<templated_with_value<-1>> (),
        std::string_view {"templated_with_value<-1>"},
        "templated_with_value"
    );

    tap.expect_eq (
        cruft::type_name<templated_with_enum<FOO>> (),
        std::string_view {"templated_with_enum<FOO>"},
        "templated_with_enum"
    );

    return tap.status ();
}