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45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
/*******************************************************************************
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* This file is part of the "https://github.com/blackmatov/meta.hpp"
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* For conditions of distribution and use, see copyright notice in LICENSE.md
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* Copyright (C) 2021-2023, by Matvey Cherevko (blackmatov@gmail.com)
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******************************************************************************/
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#include <meta.hpp/meta_all.hpp>
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#include <doctest/doctest.h>
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#include <fmt/core.h>
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namespace
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{
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// we should add META_HPP_ENABLE_POLY_INFO macro inside every class
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// to add polymorphic information to our inheritance hierarchy
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// after this we will be able to use the library's polymorphic functions
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// like `ucast` or `resolve_type(T&&)`
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struct A { META_HPP_ENABLE_POLY_INFO() };
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struct B { META_HPP_ENABLE_POLY_INFO() };
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struct C : A, B { META_HPP_ENABLE_POLY_INFO(A, B) };
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}
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TEST_CASE("meta/meta_manuals/ucast") {
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namespace meta = meta_hpp;
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C c{};
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A& a = c;
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B& b = c;
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// functions `ucast` and `resolve_type(T&&)` rely on polymorphic information
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// are provided in META_HPP_ENABLE_POLY_INFO macro
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// we can use polymorphic type resolving to get most derived class type
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CHECK(meta::resolve_type(a) == meta::resolve_type<C>());
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// and cast our pointers and references like dynamic_cast does
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CHECK(&c == &meta::ucast<C&>(a));
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// `ucast` supports cross casts, multiple and virtual inheritance as well
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CHECK(&a == meta::ucast<A*>(&b));
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}
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