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/*******************************************************************\
Module: Unit test utilities
Author: Romain Brenguier, romain.brenguier@diffblue.com
\*******************************************************************/
/// \file
/// Helper class for querying expressions
/// Throw CATCH exceptions when the query fails.
#ifndef CPROVER_TESTING_UTILS_EXPR_QUERY_H
#define CPROVER_TESTING_UTILS_EXPR_QUERY_H
#include <testing-utils/use_catch.h>
#include <util/expr_cast.h>
/// Wrapper for std::optional<exprt> with useful method for queries to be used
/// in unit tests.
template <typename T = exprt>
class expr_queryt
{
static_assert(
std::is_base_of<exprt, T>::value,
"T should inherit from exprt");
public:
explicit expr_queryt(T e) : value(std::move(e))
{
}
template <typename targett>
expr_queryt<targett> as() const
{
auto result = expr_try_dynamic_cast<targett>(static_cast<exprt>(value));
REQUIRE(result);
return expr_queryt<targett>(*result);
}
expr_queryt<exprt> operator[](const std::size_t i) const
{
REQUIRE(value.operands().size() > i);
return expr_queryt<exprt>(value.operands()[i]);
}
T get() const
{
return value;
}
private:
T value;
};
inline expr_queryt<exprt> make_query(exprt e)
{
return expr_queryt<exprt>(std::move(e));
}
#endif // CPROVER_TESTING_UTILS_EXPR_QUERY_H
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