From 1789e4675b17f274fcb0761321e6fd249a102f40 Mon Sep 17 00:00:00 2001 From: Matt Corallo Date: Mon, 11 Sep 2017 15:47:09 -0400 Subject: Force explicit double -> int conversion for CFeeRate constructor This resolves an issue where estimatesmartfee would return 999 sat/byte instead of 1000, due to floating point loss of precision Thanks to sipa for suggesting is_integral. --- src/policy/feerate.h | 7 ++++++- src/policy/fees.cpp | 4 ++-- 2 files changed, 8 insertions(+), 3 deletions(-) (limited to 'src/policy') diff --git a/src/policy/feerate.h b/src/policy/feerate.h index 7e519e3efa..3449cdd699 100644 --- a/src/policy/feerate.h +++ b/src/policy/feerate.h @@ -20,10 +20,15 @@ class CFeeRate { private: CAmount nSatoshisPerK; // unit is satoshis-per-1,000-bytes + public: /** Fee rate of 0 satoshis per kB */ CFeeRate() : nSatoshisPerK(0) { } - explicit CFeeRate(const CAmount& _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) { } + template + CFeeRate(const I _nSatoshisPerK): nSatoshisPerK(_nSatoshisPerK) { + // We've previously had bugs creep in from silent double->int conversion... + static_assert(std::is_integral::value, "CFeeRate should be used without floats"); + } /** Constructor for a fee rate in satoshis per kB. The size in bytes must not exceed (2^63 - 1)*/ CFeeRate(const CAmount& nFeePaid, size_t nBytes); /** diff --git a/src/policy/fees.cpp b/src/policy/fees.cpp index ca774cd74b..8056f385ab 100644 --- a/src/policy/fees.cpp +++ b/src/policy/fees.cpp @@ -714,7 +714,7 @@ CFeeRate CBlockPolicyEstimator::estimateRawFee(int confTarget, double successThr if (median < 0) return CFeeRate(0); - return CFeeRate(median); + return CFeeRate(llround(median)); } unsigned int CBlockPolicyEstimator::HighestTargetTracked(FeeEstimateHorizon horizon) const @@ -901,7 +901,7 @@ CFeeRate CBlockPolicyEstimator::estimateSmartFee(int confTarget, FeeCalculation if (median < 0) return CFeeRate(0); // error condition - return CFeeRate(median); + return CFeeRate(llround(median)); } -- cgit v1.2.3