From 202e9feed09f7cb7d41c004d414283b262a95204 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Fri, 13 Aug 2021 15:24:39 +0800
Subject: ...

---
 include/cru/common/Base.hpp   | 25 +++++++++++++++++++++++++
 include/cru/common/String.hpp |  5 +++++
 src/common/String.cpp         | 31 +++++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+)

diff --git a/include/cru/common/Base.hpp b/include/cru/common/Base.hpp
index 5ed1e763..2f76385e 100644
--- a/include/cru/common/Base.hpp
+++ b/include/cru/common/Base.hpp
@@ -42,6 +42,31 @@
   classname() = default;                              \
   ~classname() override = default;
 
+#define CRU_DEFINE_COMPARE_OPERATORS(classname)                           \
+  inline bool operator==(const classname& left, const classname& right) { \
+    return left.Compare(right) == 0;                                      \
+  }                                                                       \
+                                                                          \
+  inline bool operator!=(const classname& left, const classname& right) { \
+    return left.Compare(right) != 0;                                      \
+  }                                                                       \
+                                                                          \
+  inline bool operator<(const classname& left, const classname& right) {  \
+    return left.Compare(right) < 0;                                       \
+  }                                                                       \
+                                                                          \
+  inline bool operator<=(const classname& left, const classname& right) { \
+    return left.Compare(right) <= 0;                                      \
+  }                                                                       \
+                                                                          \
+  inline bool operator>(const classname& left, const classname& right) {  \
+    return left.Compare(right) > 0;                                       \
+  }                                                                       \
+                                                                          \
+  inline bool operator>=(const classname& left, const classname& right) { \
+    return left.Compare(right) >= 0;                                      \
+  }
+
 namespace cru {
 class CRU_BASE_API Object {
  public:
diff --git a/include/cru/common/String.hpp b/include/cru/common/String.hpp
index e779e3a6..c8defd13 100644
--- a/include/cru/common/String.hpp
+++ b/include/cru/common/String.hpp
@@ -139,6 +139,8 @@ class CRU_BASE_API String {
 
   std::string ToUtf8() const;
 
+  int Compare(const String& other) const;
+
  private:
   static std::uint16_t kEmptyBuffer[1];
 
@@ -147,4 +149,7 @@ class CRU_BASE_API String {
   Index size_ = 0;      // not including trailing '\0'
   Index capacity_ = 0;  // always 1 smaller than real buffer size
 };
+
+CRU_DEFINE_COMPARE_OPERATORS(String)
+
 }  // namespace cru
diff --git a/src/common/String.cpp b/src/common/String.cpp
index 91422d48..83dd8aa8 100644
--- a/src/common/String.cpp
+++ b/src/common/String.cpp
@@ -148,4 +148,35 @@ std::string String::ToUtf8() const {
   return cru::ToUtf8(std::u16string_view(Char16CStr(), size()));
 }
 
+namespace {
+inline int Compare(std::uint16_t left, std::uint16_t right) {
+  if (left < right) return -1;
+  if (left > right) return 1;
+  return 0;
+}
+}  // namespace
+
+int String::Compare(const String& other) const {
+  const_iterator i1 = cbegin();
+  const_iterator i2 = other.cbegin();
+
+  const_iterator end1 = cend();
+  const_iterator end2 = other.cend();
+
+  while (i1 != end1 && i2 != end2) {
+    int r = cru::Compare(*i1, *i2);
+    if (r != 0) return r;
+  }
+
+  if (i1 == end1) {
+    if (i2 == end1) {
+      return 0;
+    } else {
+      return -1;
+    }
+  } else {
+    return 1;
+  }
+}
+
 }  // namespace cru
-- 
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