Add Initial commit for cash check on bids and asks

CM2005 Object Oriented Programming/Topic 5/5.1.13/Wallet.cpp

@@ -0,0 +1,70 @@
+#include "Wallet.h"
+
+Wallet::Wallet()
+{
+
+}
+
+void Wallet::insertCurrency(std::string type, double amount)
+{
+  double balance;
+  if(amount < 0)
+  {
+    throw std::exception{};
+  }
+  if(currencies.count(type) == 0) // not in wallet yet
+  {
+    balance = 0;
+  }
+  else
+  {
+    balance = currencies[type];
+  }
+  balance += amount;
+  currencies[type] = balance;
+}
+
+bool Wallet::removeCurrency(std::string type, double amount)
+{
+  double balance;
+  if(amount < 0)
+  {
+    return false;
+  }
+  if(currencies.count(type) == 0) // currency not in wallet
+  {
+    return false;
+  }
+  else // is there, do we have enough?
+  {
+    if(containsCurrency(type, amount))
+    {
+      currencies[type] -= amount;
+      return true;
+    }
+    else // didn't have enough
+      return false;
+  }
+}
+
+bool Wallet::containsCurrency(std::string type, double amount)
+{
+  if(currencies.count(type) == 0) // not in wallet yet
+  {
+    return false;
+  }
+  else
+    return currencies[type] >= amount;
+}
+
+std::string Wallet::toString()
+{
+  std::string s;
+  for(std::pair<const std::string, double> pair : currencies)
+  {
+    std::string currency = pair.first;
+    double amount = pair.second;
+    s += currency + " : " + std::to_string(amount) + "\n";
+  }
+  return s;
+}