重载EString的>、>=、<、<=运算符

Demo/main.cpp

@@ -11,26 +11,13 @@ int WINAPI WinMain(
 	if (!EApp::init(L"Demo", 250, 150))
 		return -1;
 
-	EString str;
+	EString str = L"1245";
-	str += L"123";
+	EString str2 = L"1243";
-	str += L"4";
-	UINT h1 = str.hash();
 
-	EString string;
+	bool b = str > str2;
-	string = string + L"Hello" + 2017 + L"!";
+	bool b2 = str >= str2;
-	string.append(L"Hello").append(2017).append(L"!");
+	bool b3 = str < str2;
-
+	bool b4 = str <= str2;
-	EString str2;
-	str2 += 1;
-	str2 += 2L;
-	str2 += 2.3;
-	str2 += 4.6f;
-	UINT h2 = str2.hash();
-
-	str2 += std::wstring(L"sdf");
-	EString str3;
-	str3 += str2 + str;
-	UINT h3 = str3.hash();
 
 	auto scene = new EScene();
 	EApp::enterScene(scene);

Easy2D/Common/EString.cpp

@@ -249,6 +249,38 @@ EString & e2d::EString::operator+=(const std::wstring &str)
 	return *this;
 }
 
+bool e2d::EString::operator<(EString const &str) const
+{
+	for (int i = 0; i <= _size; i++)
+		if (_string[i] != str._string[i])
+			return _string[i] < str[i];
+	return false;
+}
+
+bool e2d::EString::operator<=(EString const &str) const
+{
+	for (int i = 0; i <= _size; i++)
+		if (_string[i] != str._string[i])
+			return _string[i] < str[i];
+	return true;
+}
+
+bool e2d::EString::operator>(EString const &str) const
+{
+	for (int i = 0; i <= _size; i++)
+		if (_string[i] != str._string[i])
+			return _string[i] > str[i];
+	return false;
+}
+
+bool e2d::EString::operator>=(EString const &str) const
+{
+	for (int i = 0; i <= _size; i++)
+		if (_string[i] != str._string[i])
+			return _string[i] > str[i];
+	return true;
+}
+
 unsigned int e2d::EString::hash() const
 {
 	unsigned int hash = 0;

Easy2D/ecommon.h

@@ -182,6 +182,11 @@ public:
 		return (*this) += ss.str();
 	}
 
+	bool operator < (EString const&) const;
+	bool operator <= (EString const&) const;
+	bool operator > (EString const&) const;
+	bool operator >= (EString const&) const;
+
 	friend std::wistream &operator>>(std::wistream &, EString &);
 
 	operator const wchar_t*() const { return _string; }