f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
31 lines
867 B
C++
31 lines
867 B
C++
// Copyright (C) 2023-present ScyllaDB
|
|
// SPDX-License-Identifier: (LicenseRef-ScyllaDB-Source-Available-1.0 and Apache-2.0)
|
|
|
|
#pragma once
|
|
|
|
#include <optional>
|
|
#include "expression.hh"
|
|
|
|
namespace cql3 {
|
|
|
|
class query_options;
|
|
|
|
}
|
|
|
|
namespace cql3::expr {
|
|
|
|
// Some expression users can behave differently if the expression is a bind variable
|
|
// and if that bind variable is unset. unset_bind_variable_guard encapsulates the two
|
|
// conditions.
|
|
class unset_bind_variable_guard {
|
|
// Disengaged if the operand is not exactly a single bind variable.
|
|
std::optional<bind_variable> _var;
|
|
public:
|
|
explicit unset_bind_variable_guard(const expr::expression& operand);
|
|
explicit unset_bind_variable_guard(std::nullopt_t) {}
|
|
explicit unset_bind_variable_guard(const std::optional<expr::expression>& operand);
|
|
bool is_unset(const query_options& qo) const;
|
|
};
|
|
|
|
}
|