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#include "BLI_hash.hh"
#include "BLI_utildefines.h"
#include "MEM_guardedalloc.h"
#include "testing/testing.h"
namespace blender::tests {
class ExceptionThrower {
private:
/* Use some random values that are unlikely to exist at the memory location already. */
static constexpr uint32_t is_alive_state = 0x21254634;
static constexpr uint32_t is_destructed_state = 0xFA4BC327;
uint32_t state_;
/* Make use of leak detector to check if this value has been destructed. */
void *my_memory_;
public:
mutable bool throw_during_copy;
mutable bool throw_during_move;
/* Used for hashing and comparing. */
int value;
ExceptionThrower(int value = 0)
: state_(is_alive_state),
my_memory_(MEM_mallocN(1, AT)),
throw_during_copy(false),
throw_during_move(false),
value(value)
{
}
ExceptionThrower(const ExceptionThrower &other) : ExceptionThrower(other.value)
{
EXPECT_EQ(other.state_, is_alive_state);
if (other.throw_during_copy) {
throw std::runtime_error("throwing during copy, as requested");
}
}
ExceptionThrower(ExceptionThrower &&other) : ExceptionThrower(other.value)
{
EXPECT_EQ(other.state_, is_alive_state);
if (other.throw_during_move) {
throw std::runtime_error("throwing during move, as requested");
}
}
ExceptionThrower &operator=(const ExceptionThrower &other)
{
EXPECT_EQ(other.state_, is_alive_state);
if (throw_during_copy || other.throw_during_copy) {
throw std::runtime_error("throwing during copy, as requested");
}
value = other.value;
return *this;
}
ExceptionThrower &operator=(ExceptionThrower &&other)
{
EXPECT_EQ(other.state_, is_alive_state);
if (throw_during_move || other.throw_during_move) {
throw std::runtime_error("throwing during move, as requested");
}
value = other.value;
return *this;
}
~ExceptionThrower()
{
const char *message = "";
if (state_ != is_alive_state) {
if (state_ == is_destructed_state) {
message = "Trying to destruct an already destructed instance.";
}
else {
message = "Trying to destruct an uninitialized instance.";
}
}
EXPECT_EQ(state_, is_alive_state) << message;
state_ = is_destructed_state;
MEM_freeN(my_memory_);
}
uint64_t hash() const
{
return static_cast<uint64_t>(value);
}
friend bool operator==(const ExceptionThrower &a, const ExceptionThrower &b)
{
return a.value == b.value;
}
friend bool operator!=(const ExceptionThrower &a, const ExceptionThrower &b)
{
return !(a == b);
}
};
} // namespace blender::tests
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