mirror of
https://github.com/monero-project/monero.git
synced 2024-12-24 14:49:40 -05:00
Merge pull request #8660
2a7435evariant: add mutable unwrap and visitation (koe)bc3cec4add variant class with cleaner interface than boost::variant<> (koe)
This commit is contained in:
luigi1111
commit
e752b609fc
@ -81,6 +81,9 @@ target_link_libraries(common
|
||||
PRIVATE
|
||||
${OPENSSL_LIBRARIES}
|
||||
${EXTRA_LIBRARIES})
|
||||
target_include_directories(common
|
||||
PRIVATE
|
||||
${Boost_INCLUDE_DIRS})
|
||||
|
||||
#monero_install_headers(common
|
||||
# ${common_headers})
|
||||
|
||||
167
src/common/variant.h
Normal file
167
src/common/variant.h
Normal file
@ -0,0 +1,167 @@
|
||||
// Copyright (c) 2022, The Monero Project
|
||||
//
|
||||
// All rights reserved.
|
||||
//
|
||||
// Redistribution and use in source and binary forms, with or without modification, are
|
||||
// permitted provided that the following conditions are met:
|
||||
//
|
||||
// 1. Redistributions of source code must retain the above copyright notice, this list of
|
||||
// conditions and the following disclaimer.
|
||||
//
|
||||
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
||||
// of conditions and the following disclaimer in the documentation and/or other
|
||||
// materials provided with the distribution.
|
||||
//
|
||||
// 3. Neither the name of the copyright holder nor the names of its contributors may be
|
||||
// used to endorse or promote products derived from this software without specific
|
||||
// prior written permission.
|
||||
//
|
||||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
|
||||
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
||||
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||||
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
||||
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
// Variant wrapper class.
|
||||
|
||||
#pragma once
|
||||
|
||||
//local headers
|
||||
|
||||
//third party headers
|
||||
#include <boost/blank.hpp>
|
||||
#include <boost/mpl/begin_end.hpp>
|
||||
#include <boost/mpl/distance.hpp>
|
||||
#include <boost/mpl/find.hpp>
|
||||
#include <boost/mpl/vector.hpp>
|
||||
#include <boost/none_t.hpp>
|
||||
#include <boost/variant/apply_visitor.hpp>
|
||||
#include <boost/variant/get.hpp>
|
||||
#include <boost/variant/static_visitor.hpp>
|
||||
#include <boost/variant/variant.hpp>
|
||||
|
||||
//standard headers
|
||||
#include <stdexcept>
|
||||
#include <type_traits>
|
||||
#include <utility>
|
||||
|
||||
//forward declarations
|
||||
|
||||
|
||||
namespace tools
|
||||
{
|
||||
|
||||
[[noreturn]] inline void variant_static_visitor_blank_err()
|
||||
{ throw std::runtime_error("variant: tried to visit an empty variant."); }
|
||||
[[noreturn]] inline void variant_unwrap_err()
|
||||
{ throw std::runtime_error("variant: tried to access value of incorrect type."); }
|
||||
|
||||
////
|
||||
// variant: convenience wrapper around boost::variant with a cleaner interface
|
||||
// - the variant is 'optional' - an empty variant will evaluate to 'false' and an initialized variant will be 'true'
|
||||
///
|
||||
template <typename ResultT>
|
||||
struct variant_static_visitor : public boost::static_visitor<ResultT>
|
||||
{
|
||||
/// provide visitation for empty variants
|
||||
/// - add this to your visitor with: using variant_static_visitor::operator();
|
||||
[[noreturn]] ResultT operator()(const boost::blank) { variant_static_visitor_blank_err(); }
|
||||
[[noreturn]] ResultT operator()(const boost::blank) const { variant_static_visitor_blank_err(); }
|
||||
};
|
||||
|
||||
template <typename... Types>
|
||||
class variant final
|
||||
{
|
||||
using VType = boost::variant<boost::blank, Types...>;
|
||||
|
||||
public:
|
||||
//constructors
|
||||
/// default constructor
|
||||
variant() = default;
|
||||
variant(boost::none_t) : variant{} {} //act like boost::optional
|
||||
|
||||
/// construct from variant type (use enable_if to avoid issues with copy/move constructor)
|
||||
template <typename T,
|
||||
typename std::enable_if<
|
||||
!std::is_same<
|
||||
std::remove_cv_t<std::remove_reference_t<T>>,
|
||||
variant<Types...>
|
||||
>::value,
|
||||
bool
|
||||
>::type = true>
|
||||
variant(T &&value) : m_value{std::forward<T>(value)} {}
|
||||
|
||||
//overloaded operators
|
||||
/// boolean operator: true if the variant isn't empty/uninitialized
|
||||
explicit operator bool() const noexcept { return !this->is_empty(); }
|
||||
|
||||
//member functions
|
||||
/// check if empty/uninitialized
|
||||
bool is_empty() const noexcept { return m_value.which() == 0; }
|
||||
|
||||
/// check the variant type
|
||||
template <typename T>
|
||||
bool is_type() const noexcept { return this->index() == this->type_index_of<T>(); }
|
||||
|
||||
/// try to get a handle to the embedded value (return nullptr on failure)
|
||||
template <typename T>
|
||||
T* try_unwrap() noexcept { return boost::strict_get< T>(&m_value); }
|
||||
template <typename T>
|
||||
const T* try_unwrap() const noexcept { return boost::strict_get<const T>(&m_value); }
|
||||
|
||||
/// get a handle to the embedded value
|
||||
template <typename T>
|
||||
T& unwrap()
|
||||
{
|
||||
T *value_ptr{this->try_unwrap<T>()};
|
||||
if (!value_ptr) variant_unwrap_err();
|
||||
return *value_ptr;
|
||||
}
|
||||
template <typename T>
|
||||
const T& unwrap() const
|
||||
{
|
||||
const T *value_ptr{this->try_unwrap<T>()};
|
||||
if (!value_ptr) variant_unwrap_err();
|
||||
return *value_ptr;
|
||||
}
|
||||
|
||||
/// get the type index of the currently stored type
|
||||
int index() const noexcept { return m_value.which(); }
|
||||
|
||||
/// get the type index of a requested type (compile error for invalid types) (boost::mp11 is boost 1.66.0)
|
||||
template <typename T>
|
||||
static constexpr int type_index_of() noexcept
|
||||
{
|
||||
using types = boost::mpl::vector<boost::blank, Types...>;
|
||||
using elem = typename boost::mpl::find<types, T>::type;
|
||||
using begin = typename boost::mpl::begin<types>::type;
|
||||
return boost::mpl::distance<begin, elem>::value;
|
||||
}
|
||||
|
||||
/// check if two variants have the same type
|
||||
static bool same_type(const variant<Types...> &v1, const variant<Types...> &v2) noexcept
|
||||
{ return v1.index() == v2.index(); }
|
||||
|
||||
/// apply a visitor to the variant
|
||||
template <typename VisitorT>
|
||||
typename VisitorT::result_type visit(VisitorT &&visitor)
|
||||
{
|
||||
return boost::apply_visitor(std::forward<VisitorT>(visitor), m_value);
|
||||
}
|
||||
template <typename VisitorT>
|
||||
typename VisitorT::result_type visit(VisitorT &&visitor) const
|
||||
{
|
||||
return boost::apply_visitor(std::forward<VisitorT>(visitor), m_value);
|
||||
}
|
||||
|
||||
private:
|
||||
//member variables
|
||||
/// variant of all value types
|
||||
VType m_value;
|
||||
};
|
||||
|
||||
} //namespace tools
|
||||
@ -90,6 +90,7 @@ set(unit_tests_sources
|
||||
hardfork.cpp
|
||||
unbound.cpp
|
||||
uri.cpp
|
||||
variant.cpp
|
||||
varint.cpp
|
||||
ver_rct_non_semantics_simple_cached.cpp
|
||||
ringct.cpp
|
||||
|
||||
436
tests/unit_tests/variant.cpp
Normal file
436
tests/unit_tests/variant.cpp
Normal file
@ -0,0 +1,436 @@
|
||||
// Copyright (c) 2023, The Monero Project
|
||||
//
|
||||
// All rights reserved.
|
||||
//
|
||||
// Redistribution and use in source and binary forms, with or without modification, are
|
||||
// permitted provided that the following conditions are met:
|
||||
//
|
||||
// 1. Redistributions of source code must retain the above copyright notice, this list of
|
||||
// conditions and the following disclaimer.
|
||||
//
|
||||
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
||||
// of conditions and the following disclaimer in the documentation and/or other
|
||||
// materials provided with the distribution.
|
||||
//
|
||||
// 3. Neither the name of the copyright holder nor the names of its contributors may be
|
||||
// used to endorse or promote products derived from this software without specific
|
||||
// prior written permission.
|
||||
//
|
||||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
|
||||
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
||||
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||||
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
||||
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
#include "common/variant.h"
|
||||
|
||||
#include <boost/mpl/deref.hpp>
|
||||
#include <boost/variant/recursive_wrapper.hpp>
|
||||
#include <boost/variant/recursive_variant.hpp>
|
||||
|
||||
#include "gtest/gtest.h"
|
||||
|
||||
#include <sstream>
|
||||
#include <type_traits>
|
||||
#include <vector>
|
||||
|
||||
using tools::variant;
|
||||
using tools::variant_static_visitor;
|
||||
|
||||
namespace
|
||||
{
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template <typename T>
|
||||
using strip_all_t = std::remove_reference_t<std::remove_cv_t<T>>;
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template <typename T, typename U>
|
||||
using strip_same = std::is_same<strip_all_t<T>, strip_all_t<U>>;
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template
|
||||
<
|
||||
typename PositiveType,
|
||||
typename TestType,
|
||||
typename... VariantTypes,
|
||||
class VecTypes = boost::mpl::vector<VariantTypes...>,
|
||||
class VecBegin = typename boost::mpl::begin<VecTypes>::type,
|
||||
class VecIndexT = typename boost::mpl::find<VecTypes, TestType>::type,
|
||||
size_t TYPE_INDEX = boost::mpl::distance<VecBegin, VecIndexT>::value,
|
||||
bool LAST_VARIANT_TYPE = TYPE_INDEX == sizeof...(VariantTypes) - 1
|
||||
>
|
||||
static std::enable_if_t<LAST_VARIANT_TYPE>
|
||||
test_is_type_match(const variant<VariantTypes...>& v)
|
||||
{
|
||||
constexpr bool expected = strip_same<PositiveType, TestType>();
|
||||
const bool actual = v.template is_type<TestType>();
|
||||
EXPECT_EQ(expected, actual);
|
||||
|
||||
EXPECT_FALSE(v.template is_type<boost::blank>());
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template
|
||||
<
|
||||
typename PositiveType,
|
||||
typename TestType,
|
||||
typename... VariantTypes,
|
||||
class VecTypes = boost::mpl::vector<VariantTypes...>,
|
||||
class VecBegin = typename boost::mpl::begin<VecTypes>::type,
|
||||
class VecIndexT = typename boost::mpl::find<VecTypes, TestType>::type,
|
||||
size_t TYPE_INDEX = boost::mpl::distance<VecBegin, VecIndexT>::value,
|
||||
bool LAST_VARIANT_TYPE = TYPE_INDEX == sizeof...(VariantTypes) - 1
|
||||
>
|
||||
static std::enable_if_t<!LAST_VARIANT_TYPE>
|
||||
test_is_type_match(const variant<VariantTypes...>& v)
|
||||
{
|
||||
constexpr bool expected = strip_same<PositiveType, TestType>();
|
||||
const bool actual = v.template is_type<TestType>();
|
||||
EXPECT_EQ(expected, actual);
|
||||
|
||||
using NextTypeIt = typename boost::mpl::advance<VecIndexT, boost::mpl::int_<1>>::type;
|
||||
using NextTestType = typename boost::mpl::deref<NextTypeIt>::type;
|
||||
test_is_type_match<PositiveType, NextTestType>(v);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template
|
||||
<
|
||||
typename VariantType0,
|
||||
typename... VariantTypesRest,
|
||||
typename AssignType
|
||||
>
|
||||
static void test_is_type_ref
|
||||
(
|
||||
variant<VariantType0, VariantTypesRest...>& v,
|
||||
AssignType&& val
|
||||
)
|
||||
{
|
||||
v = val;
|
||||
test_is_type_match<AssignType, VariantType0>(v);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template
|
||||
<
|
||||
typename VariantType0,
|
||||
typename... VariantTypesRest,
|
||||
typename AssignType0,
|
||||
typename... AssignTypesRest
|
||||
>
|
||||
static void test_is_type_ref
|
||||
(
|
||||
variant<VariantType0, VariantTypesRest...>& v,
|
||||
AssignType0&& val_0,
|
||||
AssignTypesRest&&... val_rest
|
||||
)
|
||||
{
|
||||
v = val_0;
|
||||
test_is_type_match<AssignType0, VariantType0>(v);
|
||||
test_is_type_ref(v, val_rest...);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template <typename... VariantTypes>
|
||||
static void test_is_type_full(VariantTypes&&... test_vals)
|
||||
{
|
||||
variant<VariantTypes...> v;
|
||||
test_is_type_ref(v, test_vals...);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template
|
||||
<
|
||||
size_t IJ = 0,
|
||||
typename... VariantTypes,
|
||||
bool END = IJ == sizeof...(VariantTypes) * sizeof...(VariantTypes)
|
||||
>
|
||||
static std::enable_if_t<END>
|
||||
test_same_type_ref
|
||||
(
|
||||
variant<VariantTypes...>& v1,
|
||||
variant<VariantTypes...>& v2,
|
||||
const std::tuple<VariantTypes...>& tup_i,
|
||||
const std::tuple<VariantTypes...>& tup_j
|
||||
)
|
||||
{ /* trivial end case */ }
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template
|
||||
<
|
||||
size_t IJ = 0,
|
||||
typename... VariantTypes,
|
||||
bool END = IJ == sizeof...(VariantTypes) * sizeof...(VariantTypes)
|
||||
>
|
||||
static std::enable_if_t<!END>
|
||||
test_same_type_ref
|
||||
(
|
||||
variant<VariantTypes...>& v1,
|
||||
variant<VariantTypes...>& v2,
|
||||
const std::tuple<VariantTypes...>& tup_i,
|
||||
const std::tuple<VariantTypes...>& tup_j
|
||||
)
|
||||
{
|
||||
constexpr size_t I = IJ / sizeof...(VariantTypes);
|
||||
constexpr size_t J = IJ % sizeof...(VariantTypes);
|
||||
constexpr bool expected = I == J;
|
||||
|
||||
v1 = std::get<I>(tup_i);
|
||||
v2 = std::get<J>(tup_j);
|
||||
const bool actual = variant<VariantTypes...>::same_type(v1, v2);
|
||||
|
||||
EXPECT_EQ(expected, actual);
|
||||
|
||||
test_same_type_ref<IJ + 1>(v1, v2, tup_i, tup_j);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
template <typename... VariantTypes>
|
||||
static void test_same_type_full
|
||||
(
|
||||
const std::tuple<VariantTypes...>& vals_i,
|
||||
const std::tuple<VariantTypes...>& vals_j
|
||||
)
|
||||
{
|
||||
using Variant = variant<VariantTypes...>;
|
||||
Variant v_i;
|
||||
Variant v_j;
|
||||
test_same_type_ref(v_i, v_j, vals_i, vals_j);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
struct test_stringify_visitor: public variant_static_visitor<std::string>
|
||||
{
|
||||
template <typename T>
|
||||
static std::string stringify(const T& t)
|
||||
{
|
||||
std::stringstream ss;
|
||||
ss << typeid(T).name();
|
||||
ss << "::";
|
||||
ss << t;
|
||||
return ss.str();
|
||||
}
|
||||
|
||||
template <class Variant, typename T>
|
||||
static void test_visitation(const Variant& v, const T& t)
|
||||
{
|
||||
EXPECT_EQ(test_stringify_visitor::stringify(t), v.visit(test_stringify_visitor()));
|
||||
}
|
||||
|
||||
// Make sure boost::blank errors
|
||||
using variant_static_visitor::operator();
|
||||
|
||||
// Visitation implementation
|
||||
template <typename T>
|
||||
std::string operator()(const T& t) const
|
||||
{
|
||||
return test_stringify_visitor::stringify(t);
|
||||
}
|
||||
};
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
} // anonymous namespace
|
||||
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, operatorbool)
|
||||
{
|
||||
variant<int8_t, uint8_t, int16_t, uint16_t, std::string> v;
|
||||
EXPECT_FALSE(v);
|
||||
v = (int16_t) 2023;
|
||||
EXPECT_TRUE(v);
|
||||
v = (int16_t) 0;
|
||||
EXPECT_TRUE(v);
|
||||
v = boost::blank{};
|
||||
EXPECT_FALSE(v);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, is_empty)
|
||||
{
|
||||
variant<int8_t, uint8_t, int16_t, uint16_t, std::string> v;
|
||||
EXPECT_TRUE(v.is_empty());
|
||||
v = (int16_t) 2023;
|
||||
EXPECT_FALSE(v.is_empty());
|
||||
v = (int16_t) 0;
|
||||
EXPECT_FALSE(v.is_empty());
|
||||
v = boost::blank{};
|
||||
EXPECT_TRUE(v.is_empty());
|
||||
|
||||
variant<> v2;
|
||||
EXPECT_TRUE(v2.is_empty());
|
||||
v2 = boost::blank{};
|
||||
EXPECT_TRUE(v2.is_empty());
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, is_type)
|
||||
{
|
||||
variant<int8_t, uint8_t, int16_t, uint16_t, std::string> v;
|
||||
EXPECT_TRUE(v.is_type<boost::blank>());
|
||||
v = (int16_t) 2023;
|
||||
EXPECT_TRUE(v.is_type<int16_t>());
|
||||
|
||||
test_is_type_full((uint32_t) 2023, (char) '\n', std::string("HOWDY"));
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, try_unwrap)
|
||||
{
|
||||
variant<int8_t, uint8_t, int16_t, uint16_t, std::string> v;
|
||||
EXPECT_FALSE(v.try_unwrap<int8_t>());
|
||||
v = (int16_t) 5252;
|
||||
ASSERT_TRUE(v.try_unwrap<int16_t>());
|
||||
EXPECT_EQ(5252, *v.try_unwrap<int16_t>());
|
||||
EXPECT_FALSE(v.try_unwrap<uint16_t>());
|
||||
EXPECT_FALSE(v.try_unwrap<std::string>());
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, unwrap)
|
||||
{
|
||||
variant<int8_t, uint8_t, int16_t, uint16_t, std::string> v;
|
||||
EXPECT_THROW(v.unwrap<int8_t>(), std::runtime_error);
|
||||
v = (int16_t) 5252;
|
||||
EXPECT_EQ(5252, v.unwrap<int16_t>());
|
||||
EXPECT_THROW(v.unwrap<uint16_t>(), std::runtime_error);
|
||||
EXPECT_THROW(v.unwrap<std::string>(), std::runtime_error);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, mutation)
|
||||
{
|
||||
variant<uint8_t> v;
|
||||
v = (uint8_t) 5;
|
||||
EXPECT_EQ(5, v.unwrap<uint8_t>());
|
||||
uint8_t &intref{v.unwrap<uint8_t>()};
|
||||
intref = 10;
|
||||
EXPECT_EQ(10, v.unwrap<uint8_t>());
|
||||
EXPECT_TRUE(v.try_unwrap<uint8_t>());
|
||||
uint8_t *intptr{v.try_unwrap<uint8_t>()};
|
||||
*intptr = 15;
|
||||
EXPECT_EQ(15, v.unwrap<uint8_t>());
|
||||
|
||||
const variant<uint8_t> &v_ref{v};
|
||||
EXPECT_EQ(15, v_ref.unwrap<uint8_t>());
|
||||
EXPECT_TRUE(v_ref.try_unwrap<uint8_t>());
|
||||
EXPECT_EQ(15, *(v_ref.try_unwrap<uint8_t>()));
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, index)
|
||||
{
|
||||
variant<int8_t, uint8_t, int16_t, uint16_t, std::string> v;
|
||||
EXPECT_EQ(0, v.index());
|
||||
v = (int8_t) 7;
|
||||
EXPECT_EQ(1, v.index());
|
||||
v = (uint8_t) 7;
|
||||
EXPECT_EQ(2, v.index());
|
||||
v = (int16_t) 7;
|
||||
EXPECT_EQ(3, v.index());
|
||||
v = (uint16_t) 7;
|
||||
EXPECT_EQ(4, v.index());
|
||||
v = "verifiable variant vying for vengence versus visa";
|
||||
EXPECT_EQ(5, v.index());
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, type_index_of)
|
||||
{
|
||||
variant<int8_t, uint8_t, int16_t, uint16_t, std::string> v;
|
||||
EXPECT_EQ(0, decltype(v)::type_index_of<boost::blank>());
|
||||
EXPECT_EQ(1, decltype(v)::type_index_of<int8_t>());
|
||||
EXPECT_EQ(2, decltype(v)::type_index_of<uint8_t>());
|
||||
EXPECT_EQ(3, decltype(v)::type_index_of<int16_t>());
|
||||
EXPECT_EQ(4, decltype(v)::type_index_of<uint16_t>());
|
||||
EXPECT_EQ(5, decltype(v)::type_index_of<std::string>());
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, constexpr_type_index_of)
|
||||
{
|
||||
variant<int8_t, uint8_t, int16_t, uint16_t, std::string> v;
|
||||
constexpr int TINDEX0 = decltype(v)::type_index_of<boost::blank>();
|
||||
EXPECT_EQ(0, TINDEX0);
|
||||
constexpr int TINDEX5 = decltype(v)::type_index_of<std::string>();
|
||||
EXPECT_EQ(5, TINDEX5);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, same_type)
|
||||
{
|
||||
const std::tuple<int, std::string, char> vals_i(77840, "Hullubaloo", '\0');
|
||||
const std::tuple<int, std::string, char> vals_j(1876, "Canneck", '\t');
|
||||
test_same_type_full(vals_i, vals_j);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, visit)
|
||||
{
|
||||
variant<int8_t, uint8_t, int16_t, uint16_t, std::string> v;
|
||||
EXPECT_THROW(v.visit(test_stringify_visitor()), std::runtime_error);
|
||||
|
||||
v = "Rev";
|
||||
test_stringify_visitor::test_visitation(v, std::string("Rev"));
|
||||
|
||||
v = (int16_t) 2001;
|
||||
test_stringify_visitor::test_visitation(v, (int16_t) 2001);
|
||||
EXPECT_NE(test_stringify_visitor::stringify((uint16_t) 2001), v.visit(test_stringify_visitor()));
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
TEST(variant, ad_hoc_recursion)
|
||||
{
|
||||
struct left_t;
|
||||
struct right_t;
|
||||
|
||||
using twisty = variant<boost::recursive_wrapper<left_t>, boost::recursive_wrapper<right_t>>;
|
||||
|
||||
struct left_t
|
||||
{
|
||||
twisty l;
|
||||
};
|
||||
|
||||
struct right_t
|
||||
{
|
||||
twisty r;
|
||||
};
|
||||
|
||||
auto right = [](twisty&& t = {}) -> twisty
|
||||
{
|
||||
right_t r;
|
||||
r.r = t;
|
||||
return r;
|
||||
};
|
||||
|
||||
auto left = [](twisty&& t = {}) -> twisty
|
||||
{
|
||||
left_t l;
|
||||
l.l = t;
|
||||
return l;
|
||||
};
|
||||
|
||||
struct twisty_counter: variant_static_visitor<std::pair<int, int>>
|
||||
{
|
||||
std::pair<int, int> operator()(boost::blank) const
|
||||
{
|
||||
return {0, 0};
|
||||
}
|
||||
|
||||
std::pair<int, int> operator()(const left_t& l) const
|
||||
{
|
||||
auto count = l.l.visit(twisty_counter());
|
||||
count.first += 1;
|
||||
return count;
|
||||
}
|
||||
|
||||
std::pair<int, int> operator()(const right_t& r) const
|
||||
{
|
||||
auto count = r.r.visit(twisty_counter());
|
||||
count.second += 1;
|
||||
return count;
|
||||
}
|
||||
};
|
||||
|
||||
const twisty tw = left(left(right(right(left(right(left(right(left()))))))));
|
||||
|
||||
int left_count, right_count;
|
||||
std::tie(left_count, right_count) = tw.visit(twisty_counter());
|
||||
|
||||
EXPECT_EQ(5, left_count);
|
||||
EXPECT_EQ(4, right_count);
|
||||
}
|
||||
//-------------------------------------------------------------------------------------------------------------------
|
||||
Loading…
Reference in New Issue
Block a user