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// This file is a part of toml++ and is subject to the the terms of the MIT license.
// Copyright (c) Mark Gillard <mark.gillard@outlook.com.au>
// See https://github.com/marzer/tomlplusplus/blob/master/LICENSE for the full license text.
// SPDX-License-Identifier: MIT
#include "tests.h"
TOML_DISABLE_SPAM_WARNINGS;
TEST_CASE("node::visit")
{
value<int64_t> val{ 3 };
// check lvalue propagates correctly
static_cast<node&>(val).visit(
[](auto&& v) noexcept
{
using val_ref_type = decltype(v);
static_assert(std::is_lvalue_reference_v<val_ref_type>);
using val_type = std::remove_reference_t<val_ref_type>;
static_assert(!std::is_const_v<val_type>);
static_assert(!std::is_volatile_v<val_type>);
});
// check rvalue propagates correctly
static_cast<node&&>(val).visit(
[](auto&& v) noexcept
{
using val_ref_type = decltype(v);
static_assert(std::is_rvalue_reference_v<val_ref_type>);
using val_type = std::remove_reference_t<val_ref_type>;
static_assert(!std::is_const_v<val_type>);
static_assert(!std::is_volatile_v<val_type>);
});
// check const lvalue propagates correctly
static_cast<const node&>(val).visit(
[](auto&& v) noexcept
{
using val_ref_type = decltype(v);
static_assert(std::is_lvalue_reference_v<val_ref_type>);
using val_type = std::remove_reference_t<val_ref_type>;
static_assert(std::is_const_v<val_type>);
static_assert(!std::is_volatile_v<val_type>);
});
// check const rvalue propagates correctly
static_cast<const node&&>(val).visit(
[](auto&& v) noexcept
{
using val_ref_type = decltype(v);
static_assert(std::is_rvalue_reference_v<val_ref_type>);
using val_type = std::remove_reference_t<val_ref_type>;
static_assert(std::is_const_v<val_type>);
static_assert(!std::is_volatile_v<val_type>);
});
// check noexcept
static constexpr auto throwing_visitor = [](auto&&) noexcept(false) {};
static constexpr auto non_throwing_visitor = [](auto&&) noexcept(true) {};
static_assert(!noexcept(static_cast<node&>(val).visit(throwing_visitor)));
static_assert(!noexcept(static_cast<node&&>(val).visit(throwing_visitor)));
static_assert(!noexcept(static_cast<const node&>(val).visit(throwing_visitor)));
static_assert(!noexcept(static_cast<const node&&>(val).visit(throwing_visitor)));
static_assert(noexcept(static_cast<node&>(val).visit(non_throwing_visitor)));
static_assert(noexcept(static_cast<node&&>(val).visit(non_throwing_visitor)));
static_assert(noexcept(static_cast<const node&>(val).visit(non_throwing_visitor)));
static_assert(noexcept(static_cast<const node&&>(val).visit(non_throwing_visitor)));
// check return
static constexpr auto returns_boolean = [](auto& v) noexcept { return toml::is_integer<decltype(v)>; };
auto return_test = static_cast<node&>(val).visit(returns_boolean);
static_assert(std::is_same_v<decltype(return_test), bool>);
CHECK(return_test == true);
}
TEST_CASE("node_view::visit")
{
value<int64_t> val{ 3 };
auto view = node_view{ val };
auto cview = node_view{ std::as_const(val) };
static_assert(!std::is_same_v<decltype(view), decltype(cview)>);
// check mutable views propagate correctly
view.visit(
[](auto&& v) noexcept
{
using val_ref_type = decltype(v);
static_assert(std::is_lvalue_reference_v<val_ref_type>);
using val_type = std::remove_reference_t<val_ref_type>;
static_assert(!std::is_const_v<val_type>);
static_assert(!std::is_volatile_v<val_type>);
});
// check const views propagate correctly
cview.visit(
[](auto&& v) noexcept
{
using val_ref_type = decltype(v);
static_assert(std::is_lvalue_reference_v<val_ref_type>);
using val_type = std::remove_reference_t<val_ref_type>;
static_assert(std::is_const_v<val_type>);
static_assert(!std::is_volatile_v<val_type>);
});
// check noexcept
static constexpr auto throwing_visitor = [](auto&&) noexcept(false) {};
static constexpr auto non_throwing_visitor = [](auto&&) noexcept(true) {};
static_assert(!noexcept(view.visit(throwing_visitor)));
static_assert(!noexcept(cview.visit(throwing_visitor)));
static_assert(noexcept(view.visit(non_throwing_visitor)));
static_assert(noexcept(cview.visit(non_throwing_visitor)));
// check return
static constexpr auto returns_boolean = [](auto&& v) noexcept { return toml::is_integer<decltype(v)>; };
auto return_test = view.visit(returns_boolean);
static_assert(std::is_same_v<decltype(return_test), bool>);
CHECK(return_test == true);
// check that null views don't invoke the visitor
// clang-format off
auto null_view = decltype(view){};
auto null_cview = decltype(cview){};
unsigned count{};
unsigned mask{};
view.visit([&](auto&&) noexcept { count++; mask |= 0b0001u; });
cview.visit([&](auto&&) noexcept { count++; mask |= 0b0010u; });
null_view.visit([&](auto&&) noexcept { count++; mask |= 0b0100u; });
null_cview.visit([&](auto&&) noexcept { count++; mask |= 0b1000u; });
CHECK(count == 2u);
CHECK(mask == 0b0011u);
// clang-format on
}
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