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116 lines
2.5 KiB
C++
116 lines
2.5 KiB
C++
#ifndef XRPL_LEDGER_RULES_H_INCLUDED
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#define XRPL_LEDGER_RULES_H_INCLUDED
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#include <xrpl/basics/base_uint.h>
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#include <xrpl/beast/hash/uhash.h>
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#include <xrpl/protocol/STVector256.h>
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#include <unordered_set>
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namespace ripple {
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bool
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isFeatureEnabled(uint256 const& feature);
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class DigestAwareReadView;
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/** Rules controlling protocol behavior. */
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class Rules
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{
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private:
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class Impl;
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// Carrying impl by shared_ptr makes Rules comparatively cheap to pass
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// by value.
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std::shared_ptr<Impl const> impl_;
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public:
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Rules(Rules const&) = default;
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Rules(Rules&&) = default;
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Rules&
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operator=(Rules const&) = default;
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Rules&
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operator=(Rules&&) = default;
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Rules() = delete;
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/** Construct an empty rule set.
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These are the rules reflected by
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the genesis ledger.
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*/
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explicit Rules(std::unordered_set<uint256, beast::uhash<>> const& presets);
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private:
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// Allow a friend function to construct Rules.
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friend Rules
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makeRulesGivenLedger(
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DigestAwareReadView const& ledger,
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Rules const& current);
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friend Rules
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makeRulesGivenLedger(
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DigestAwareReadView const& ledger,
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std::unordered_set<uint256, beast::uhash<>> const& presets);
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Rules(
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std::unordered_set<uint256, beast::uhash<>> const& presets,
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std::optional<uint256> const& digest,
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STVector256 const& amendments);
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std::unordered_set<uint256, beast::uhash<>> const&
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presets() const;
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public:
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/** Returns `true` if a feature is enabled. */
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bool
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enabled(uint256 const& feature) const;
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/** Returns `true` if two rule sets are identical.
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@note This is for diagnostics.
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*/
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bool
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operator==(Rules const&) const;
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bool
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operator!=(Rules const& other) const;
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};
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std::optional<Rules> const&
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getCurrentTransactionRules();
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void
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setCurrentTransactionRules(std::optional<Rules> r);
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/** RAII class to set and restore the current transaction rules
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*/
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class CurrentTransactionRulesGuard
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{
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public:
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explicit CurrentTransactionRulesGuard(Rules r)
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: saved_(getCurrentTransactionRules())
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{
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setCurrentTransactionRules(std::move(r));
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}
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~CurrentTransactionRulesGuard()
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{
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setCurrentTransactionRules(saved_);
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}
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CurrentTransactionRulesGuard() = delete;
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CurrentTransactionRulesGuard(CurrentTransactionRulesGuard const&) = delete;
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CurrentTransactionRulesGuard&
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operator=(CurrentTransactionRulesGuard const&) = delete;
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private:
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std::optional<Rules> saved_;
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};
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} // namespace ripple
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#endif
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