Diff: mystring.h

Revision:

5:e2c275b33bbf

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mystring.h	Fri Mar 25 06:08:40 2016 +0900
@@ -0,0 +1,46 @@
+// mystring.h 2016/3/24
+#pragma once
+class mystring {
+public:
+    mystring() {
+        m_cap = 4;
+        m_buf = new char[m_cap];
+        m_size = 0;
+        m_buf[m_size] = '\0';
+    }
+    ~mystring() {
+        delete[] m_buf;
+    }
+    const char *c_str() const {return m_buf; }
+    void clear() {
+        delete[] m_buf;
+        m_cap = 4;
+        m_buf = new char[m_cap];
+        m_size = 0;
+        m_buf[m_size] = '\0';
+    }
+    void operator +=(char c) { push_back(c); }
+    bool operator ==(const char* s) const { return strcmp(m_buf, s) == 0; }
+    void push_back(char c) {
+        if (m_size+1 < m_cap) {
+            m_cap += 4;
+            char* new_buf = new char[m_cap];
+            for(int i = 0; i < m_size; i++) {
+                new_buf[i] = m_buf[i];
+            }
+            delete[] m_buf;
+            m_buf = new_buf;
+        }
+        m_buf[m_size++] = c;
+        m_buf[m_size] = '\0';
+    }
+    char& operator[](size_t pos) const { return at(pos); }
+    char& at(size_t pos) const { return m_buf[pos]; }
+    size_t size() const { return m_size; }
+
+private:
+    size_t m_size;
+    size_t m_cap;
+    char *m_buf;
+};
+