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ConstraintTypeBackwardCompatibility.cpp
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ConstraintTypeBackwardCompatibility.cpp
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/*
* @author huanmie<[email protected]>
* @date 2022.4.28
*/
#if __cplusplus < 202002L
// Don't forget <tuple>
#include <set>
#include <list>
#include <tuple>
#include <deque>
#include <vector>
#include <iostream>
#include <functional>
#include <forward_list>
#include "metalang99.h"
#define ShowErrorMessage
#include "ConstraintType.h"
struct Byte { signed char value; };
struct Short { short value; };
struct Integer { int value; };
struct Long { long long value; };
template<typename T1, typename T2>
struct A {};
template<typename T1, typename T2>
struct B {};
template<typename T1, typename T2, int V>
struct C {};
namespace ConstraintType
{
ConstructBasicEligibleType(BasicEligibleType, Byte, Short, Integer, Long);
// Layer:[1]
AddTypeLayer(1, std::list);
AddTypeLayer(1, std::deque);
AddTypeLayer(1, std::vector);
AddTypeLayer(1, std::forward_list);
// For example: std::vector<Byte>
ConstructEligibleType(EligibleType1, 1, 1, Byte, Short, Integer, Long);
AddTypeLayer(2, std::set);
// Layer:[2,1]. Use common layer with EligibleType1.
// For example: std::set<std::vector<Integer>>
ConstructEligibleType(EligibleType2, 2, 2, Byte, Short, Integer, Long);
// Layer:[11,10]. Use different layer to avoid collision.
AddTypeLayer(10, std::vector);
AddTypeLayer(11, std::vector);
// For example: std::vector<std::vector<Short>>
ConstructEligibleType(EligibleType3, 2, 11, Byte, Short, Integer, Long);
AddTypeLayerWithPosition(0x10, 1, A);
// A<?,Byte>
ConstructEligibleTypeWithPosition(EligibleType4, 1, 0x10, 1, Byte);
// Same with AddTypeLayer(0x11, B); if B<T2> has default template parameter.
AddTypeLayerWithPosition(0x11, 0, B);
// Layer:[0x11,0x10]. Check B<0,1> at 0x11, then get B<0> parameter to check with A<0,1> at 0x10, finally check A<1> with Long.
// So, arguments are 0x11,0,1.
// B<A<?,Long>,?>
ConstructEligibleTypeWithPosition(EligibleType5, 2, 0x11, 0, 1, Long);
AddTypeLayerWithPosition(0x11, 1, B);
// B<?,int>
// You can combine EligibleType5 and EligibleType6 to construct more complicated constraints.
ConstructEligibleTypeWithPosition(EligibleType6, 1, 0x11, 1, int);
// Ignore the upper layer just focus on underlying type.
// ?<Byte||Short||Integer||Long>
AddTypeLayer(0x20, Any);
ConstructEligibleType(EligibleType7, 1, 0x20, Byte, Short, Integer, Long);
AddTypeLayer(0x21, Any);
ConstructEligibleType(EligibleType7_1, 2, 0x21, Byte, Short, Integer, Long);
// Ignore the underlying type just focus on upper layer.
// std::vector<?>
AddTypeLayer(0x22, std::vector);
ConstructEligibleType(EligibleType8, 1, 0x21, Any<void>);
#if __cplusplus >= 201703L
// (5,10)
ConstructBasicEligibleValue(EligibleValue0, std::greater<void>, 5);
ConstructBasicEligibleValue(EligibleValue1, std::less<void>, 10);
// C<?,?,(5,10)>
AddValueLayerWithPosition(0x30, 2, C, T, T, V);
ConstructEligibleValueWithPosition(EligibleValue2, 1, 0x30, 2, std::greater<void>, 5);
ConstructEligibleValueWithPosition(EligibleValue2_1, 1, 0x30, 2, std::less<void>, 10);
ConstructEligibleValueWithPosition(EligibleValue2_2, 1, 0x30, 2, std::tuple<std::greater<void>, std::less<void>>, 5, 10);
// Compile error if you set ShowErrorMessage macro
ConstructEligibleValueWithPosition(EligibleValue2_3, 1, 0x30, 2, std::tuple<std::greater<void>, std::less<void>>, 5, 10, 1);
ConstructEligibleValueWithPosition(EligibleValue2_4, 1, 0x30, 2, std::tuple<std::greater<void>, std::less<void>>, 5);
AddTypeLayer(0x4A, std::vector);
AddTypeLayer(0x49, Any);
AddTypeLayer(0x48, Any);
AddTypeLayer(0x47, Any);
AddTypeLayer(0x46, Any);
AddTypeLayer(0x45, Any);
AddTypeLayer(0x44, Any);
AddTypeLayer(0x43, Any);
AddTypeLayer(0x42, Any);
AddTypeLayer(0x41, Any);
AddValueLayerWithPosition(0x40, 2, C, T, T, V);
ConstructEligibleValueWithPosition(EligibleValue3, 11, 0x4A,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, // Type or Value Index
std::tuple<std::greater<void>, std::less<void>>, 5, 10);
ConstructGetUnderlyingValue(GetCThirdValue, 1, 0x30, 2);
#endif // __cplusplus >= 201703L
}
class Test
{
public:
template<typename T, typename Allow = std::enable_if_t<ConstraintType::BasicEligibleType<T>>>
static void TestBasicEligibleType(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleType1<T>>>
static void TestEligibleType1(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleType2<T>>>
static void TestEligibleType2(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleType3<T>>>
static void TestEligibleType3(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleType4<T>>>
static void TestEligibleType4(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleType5<T>>>
static void TestEligibleType5(const T&) {}
// B<A<?,Long>,int>
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleType5<T>&& ConstraintType::EligibleType6<T>>>
static void TestCombinedEligibleType(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleType7<T>>>
static void TestEligibleType7(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleType7_1<T>>>
static void TestEligibleType7_1(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleType8<T>>>
static void TestEligibleType8(const T&) {}
#if __cplusplus >= 201703L
template<auto V, typename Allow = std::enable_if_t<ConstraintType::EligibleValue0<V>&& ConstraintType::EligibleValue1<V>>>
static void TestEligibleValue1() {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleValue2<T>&& ConstraintType::EligibleValue2_1<T>>>
static void TestEligibleValue2(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleValue2_2<T>>>
static void TestEligibleValue2_2(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleValue2_3<T>>>
static void TestEligibleValue2_3(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleValue2_4<T>>>
static void TestEligibleValue2_4(const T&) {}
template<typename T, typename Allow = std::enable_if_t<ConstraintType::EligibleValue3<T>>>
static void TestEligibleValue3(const T&) {}
#endif // __cplusplus >= 201703L
};
int main()
{
//Test::TestBasicEligibleType(1); // Error: int not in basic eligible type set.
Test::TestBasicEligibleType(Long{ 1 }); // OK
//Test::TestEligibleType1(std::vector<int>()); // Error: int not in basic eligible type set.
//Test::TestEligibleType1(std::set<Byte>()); // Error: std::set not in layer1's eligible type set
Test::TestEligibleType1(std::vector<Byte>{ { 1 }, { 2 }, { 3 } }); // OK
//Test::TestEligibleType2(std::vector<std::vector<Integer>>()); // Error: std::vector not in layer2's eligible type set
//Test::TestEligibleType2(std::set<std::set<Integer>>()); // Error: std::set not in layer1's eligible type set
//Test::TestEligibleType2(std::set<std::vector<int>>()); // Error: int not in basic eligible type set.
Test::TestEligibleType2(std::set<std::vector<Integer>>()); // OK
Test::TestEligibleType3(std::vector<std::vector<Short>>()); // OK
//Test::TestEligibleType4(A<int, Long>()); // Error: second template parameter not in eligible type set
Test::TestEligibleType4(A<int, Byte>()); // OK
// B<A<?,Long>,?>
//Test::TestEligibleType5(B<A<int, int>, int>()); // Error: int not in basic eligible type set.
//Test::TestEligibleType5(B<B<int,Long>,int>()); // Error: B not in layer1's eligible type set
//Test::TestEligibleType5(A<A<int, Long>, int>()); // Error: A not in layer2's eligible type set
Test::TestEligibleType5(B<A<int, Long>, int>()); // OK
Test::TestEligibleType5(B<A<double, Long>, int>()); // OK
Test::TestEligibleType5(B<A<int, Long>, char>()); // OK
// B<A<?,Long>,int>
//Test::TestCombinedEligibleType(B<A<int, Long>, double>()); // Error: double doesn't meet EligibleType6's requirements(int)
//Test::TestCombinedEligibleType(B<A<int, double>, int>()); // Error: double doesn't meet EligibleType5's requirements(Long)
Test::TestCombinedEligibleType(B<A<int, Long>, int>()); // OK
// ?<Byte||Short||Integer||Long>
//Test::TestEligibleType7(std::vector<int>()); // Error: int not in basic eligible type set.
Test::TestEligibleType7(std::vector<Long>()); // OK. Any
Test::TestEligibleType7(A<Long, int>()); // OK. Any
Test::TestEligibleType7_1(std::vector<std::list<Byte>>()); // OK. Any<Any<...>>
// std::vector<?>
//Test::TestEligibleType8(std::list<int>()); // Error: double doesn't meet EligibleType6's requirements(std::vector)
Test::TestEligibleType8(std::vector<int>()); // OK. Any
#if __cplusplus >= 201703L
// (5,10)
//Test::TestEligibleValue1<4>(); // Error: 4 less than 5
Test::TestEligibleValue1<8>(); // OK
// C<?,?,(5,10)>
//Test::TestEligibleValue2(C<int, int, 10>()); // Error: 10 not less than 10
Test::TestEligibleValue2(C<int, int, 7>()); // OK
Test::TestEligibleValue2_2(C<int, int, 7>()); // OK
// Compile error if you set ShowErrorMessage macro
//Test::TestEligibleValue2_3(C<int, int, 7>()); // Error: Tuple size is not equal to Parameters size
//Test::TestEligibleValue2_4(C<int, int, 7>()); // Error: Tuple size is not equal to Parameters size
// Error: std::list doesn't meet EligibleValue3's requirements(std::vector)
//Test::TestEligibleValue3(std::list<std::list<std::deque<std::vector<std::list<std::vector<std::list<std::list<std::list<std::list<C<int, double, 6>>>>>>>>>>>());
// Error: 3 doesn't meet EligibleValue3's requirements(Type)
//Test::TestEligibleValue3(std::vector<std::list<std::deque<std::vector<std::list<std::vector<std::list<std::list<std::list<std::list<C<int, 3, 6>>>>>>>>>>>());
// OK
Test::TestEligibleValue3(std::vector<std::list<std::deque<std::vector<std::list<std::vector<std::list<std::list<std::list<std::list<C<int, double, 6>>>>>>>>>>>());
static_assert(ConstraintType::GetCThirdValue(C<int, int, 7 >()) == 7);
#endif // __cplusplus >= 201703L
return 0;
}
#endif // __cplusplus < 202002L