Add CMerkleTx::IsImmatureCoinBase method

All but one call to GetBlocksToMaturity is testing it relative to 0
for the purposes of determining whether the coinbase tx is immature.
In such case, the value greater than 0 implies that the tx is coinbase,
so there is no need to separately test that status.

This names the concept for easy singular use.

1 files changed, 12 insertions, 9 deletions

diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 3ec6aefaec..540a7b0fc6 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -1894,7 +1894,7 @@ CAmount CWalletTx::GetDebit(const isminefilter& filter) const
 CAmount CWalletTx::GetCredit(const isminefilter& filter) const
 {
     // Must wait until coinbase is safely deep enough in the chain before valuing it
-    if (IsCoinBase() && GetBlocksToMaturity() > 0)
+    if (IsImmatureCoinBase())
         return 0;
 
     CAmount credit = 0;
@@ -1926,8 +1926,7 @@ CAmount CWalletTx::GetCredit(const isminefilter& filter) const
 
 CAmount CWalletTx::GetImmatureCredit(bool fUseCache) const
 {
-    if (IsCoinBase() && GetBlocksToMaturity() > 0 && IsInMainChain())
-    {
+    if (IsImmatureCoinBase() && IsInMainChain()) {
         if (fUseCache && fImmatureCreditCached)
             return nImmatureCreditCached;
         nImmatureCreditCached = pwallet->GetCredit(*tx, ISMINE_SPENDABLE);
@@ -1944,7 +1943,7 @@ CAmount CWalletTx::GetAvailableCredit(bool fUseCache, const isminefilter& filter
         return 0;
 
     // Must wait until coinbase is safely deep enough in the chain before valuing it
-    if (IsCoinBase() && GetBlocksToMaturity() > 0)
+    if (IsImmatureCoinBase())
         return 0;
 
     CAmount* cache = nullptr;
@@ -1985,8 +1984,7 @@ CAmount CWalletTx::GetAvailableCredit(bool fUseCache, const isminefilter& filter
 
 CAmount CWalletTx::GetImmatureWatchOnlyCredit(const bool fUseCache) const
 {
-    if (IsCoinBase() && GetBlocksToMaturity() > 0 && IsInMainChain())
-    {
+    if (IsImmatureCoinBase() && IsInMainChain()) {
         if (fUseCache && fImmatureWatchCreditCached)
             return nImmatureWatchCreditCached;
         nImmatureWatchCreditCached = pwallet->GetCredit(*tx, ISMINE_WATCH_ONLY);
@@ -2199,7 +2197,7 @@ CAmount CWallet::GetLegacyBalance(const isminefilter& filter, int minDepth, cons
     for (const auto& entry : mapWallet) {
         const CWalletTx& wtx = entry.second;
         const int depth = wtx.GetDepthInMainChain();
-        if (depth < 0 || !CheckFinalTx(*wtx.tx) || wtx.GetBlocksToMaturity() > 0) {
+        if (depth < 0 || !CheckFinalTx(*wtx.tx) || wtx.IsImmatureCoinBase()) {
             continue;
         }
 
@@ -2259,7 +2257,7 @@ void CWallet::AvailableCoins(std::vector<COutput> &vCoins, bool fOnlySafe, const
         if (!CheckFinalTx(*pcoin->tx))
             continue;
 
-        if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
+        if (pcoin->IsImmatureCoinBase())
             continue;
 
         int nDepth = pcoin->GetDepthInMainChain();
@@ -3521,7 +3519,7 @@ std::map<CTxDestination, CAmount> CWallet::GetAddressBalances()
             if (!pcoin->IsTrusted())
                 continue;
 
-            if (pcoin->IsCoinBase() && pcoin->GetBlocksToMaturity() > 0)
+            if (pcoin->IsImmatureCoinBase())
                 continue;
 
             int nDepth = pcoin->GetDepthInMainChain();
@@ -4397,6 +4395,11 @@ int CMerkleTx::GetBlocksToMaturity() const
     return std::max(0, (COINBASE_MATURITY+1) - GetDepthInMainChain());
 }
 
+bool CMerkleTx::IsImmatureCoinBase() const
+{
+    // note GetBlocksToMaturity is 0 for non-coinbase tx
+    return GetBlocksToMaturity() > 0;
+}
 
 bool CWalletTx::AcceptToMemoryPool(const CAmount& nAbsurdFee, CValidationState& state)
 {