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31 lines
867 B
C++
31 lines
867 B
C++
// Copyright (C) 2023-present ScyllaDB
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// SPDX-License-Identifier: (LicenseRef-ScyllaDB-Source-Available-1.1 and Apache-2.0)
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#pragma once
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#include <optional>
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#include "expression.hh"
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namespace cql3 {
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class query_options;
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}
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namespace cql3::expr {
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// Some expression users can behave differently if the expression is a bind variable
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// and if that bind variable is unset. unset_bind_variable_guard encapsulates the two
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// conditions.
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class unset_bind_variable_guard {
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// Disengaged if the operand is not exactly a single bind variable.
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std::optional<bind_variable> _var;
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public:
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explicit unset_bind_variable_guard(const expr::expression& operand);
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explicit unset_bind_variable_guard(std::nullopt_t) {}
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explicit unset_bind_variable_guard(const std::optional<expr::expression>& operand);
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bool is_unset(const query_options& qo) const;
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};
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}
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