feerate.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_POLICY_FEERATE_H
#define BITCOIN_POLICY_FEERATE_H
 
#include <consensus/amount.h>
#include <serialize.h>
 
 
#include <cstdint>
#include <string>
#include <type_traits>
 
const std::string CURRENCY_UNIT = "BTC"; // One formatted unit
const std::string CURRENCY_ATOM = "sat"; // One indivisible minimum value unit
 
/* Used to determine type of fee estimation requested */
enum class FeeEstimateMode {
    UNSET,        
    ECONOMICAL,   
    CONSERVATIVE, 
    BTC_KVB,      
    SAT_VB,       
};
 
class CFeeRate
{
private:
    CAmount nSatoshisPerK;
 
public:
    CFeeRate() : nSatoshisPerK(0) { }
    template<typename I>
    explicit CFeeRate(const I _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) {
        // We've previously had bugs creep in from silent double->int conversion...
        static_assert(std::is_integral<I>::value, "CFeeRate should be used without floats");
    }
 
    CFeeRate(const CAmount& nFeePaid, uint32_t num_bytes);
 
    CAmount GetFee(uint32_t num_bytes) const;
 
    CAmount GetFeePerK() const { return nSatoshisPerK; }
    friend bool operator<(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK < b.nSatoshisPerK; }
    friend bool operator>(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK > b.nSatoshisPerK; }
    friend bool operator==(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK == b.nSatoshisPerK; }
    friend bool operator<=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK <= b.nSatoshisPerK; }
    friend bool operator>=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK >= b.nSatoshisPerK; }
    friend bool operator!=(const CFeeRate& a, const CFeeRate& b) { return a.nSatoshisPerK != b.nSatoshisPerK; }
    CFeeRate& operator+=(const CFeeRate& a) { nSatoshisPerK += a.nSatoshisPerK; return *this; }
    std::string ToString(const FeeEstimateMode& fee_estimate_mode = FeeEstimateMode::BTC_KVB) const;
    friend CFeeRate operator*(const CFeeRate& f, int a) { return CFeeRate(a * f.nSatoshisPerK); }
    friend CFeeRate operator*(int a, const CFeeRate& f) { return CFeeRate(a * f.nSatoshisPerK); }
 
    SERIALIZE_METHODS(CFeeRate, obj) { READWRITE(obj.nSatoshisPerK); }
};
 
#endif // BITCOIN_POLICY_FEERATE_H