Add example and readme, update header

bank.zc

@@ -0,0 +1,93 @@
+#include <string.h>
+
+class(BankAccount, {
+    Integer money;
+    String name;
+    Method(BankAccount, deposit, Integer, Integer amount);
+    Method(BankAccount, withdraw, Integer, Integer amount);
+    Method(BankAccount, getAmount, Integer);
+    Destructor(BankAccount);
+});
+
+method(BankAccount, deposit, Integer, Integer amount) {
+    self->money += amount;
+    return self->money;
+}
+
+method(BankAccount, withdraw, Integer, Integer amount) {
+    self->money -= amount;
+    return self->money;
+}
+
+method(BankAccount, getAmount, Integer) {
+    return self->money;
+}
+
+destructor(BankAccount) {}
+
+constructor(BankAccount, String name) {
+    return (BankAccount) {
+        .money = 10,
+        .name = name,
+        .deposit = &__BankAccount_deposit,
+        .withdraw = &__BankAccount_withdraw,
+        .getAmount = &__BankAccount_getAmount,
+        .destructor_fn = &destroyBankAccount
+    };
+}
+
+class(Bank, {
+    Integer size;
+    Integer capacity;
+    BankAccount list accounts;
+    Method(Bank, addAccount, BankAccount*, BankAccount account);
+    Method(Bank, getAccount, BankAccount*, String name);
+    Destructor(Bank);
+});
+
+method(Bank, addAccount, BankAccount*, BankAccount account) {
+    if (self->size plus 1 greaterorequalto self->capacity) {
+        resize(self->accounts, self->capacity * 2);
+    }
+    self->accounts[self->size] = account;
+    self->size increment;
+    return &self->accounts[self->size - 1];
+}
+
+method(Bank, getAccount, BankAccount*, String name) {
+    for (Integer i = 0; i lessthan self->size; i increment) {
+        if (strcmp(name, self->accounts[i].name) equals 0) {
+            return &self->accounts[i];
+        }
+    }
+    return NULL;
+}
+
+destructor(Bank) {
+    for (Integer i = 0; i lessthan self->size; i increment) {
+        forget(self->accounts[i]);
+    }
+    free(self->accounts);
+}
+
+constructor(Bank) {
+    return (Bank) {
+        .size = 0,
+        .capacity = 32,
+        .accounts = many(BankAccount, 32),
+        .addAccount = &__Bank_addAccount,
+        .getAccount = &__Bank_getAccount,
+        .destructor_fn = &destroyBank
+    };
+}
+
+entry {
+    Bank myBank = newBank();
+    myBank.addAccount(&myBank, newBankAccount("Maxwell"));
+    myBank.addAccount(&myBank, newBankAccount("John Citizen"));
+    myBank.addAccount(&myBank, newBankAccount("Jane Citizen"));
+
+    BankAccount* max = myBank.getAccount(&myBank, "Maxwell");
+    max->deposit(max, 100);
+    print(max->getAmount(max));
+}