1 files changed, 53 insertions, 0 deletions
diff --git a/tools/common/helpers.h b/tools/common/helpers.h
new file mode 100644
index 00000000..8111483a
--- /dev/null
+++ b/tools/common/helpers.h
@@ -0,0 +1,53 @@
+#pragma once
+
+#include <string>
+#include <cstring>
+#include <iostream>
+
+namespace helpers {
+
+class string_view
+{
+    const char* m_start;
+    const size_t m_len;
+public:
+    string_view(const char* s, size_t n):
+        m_start(s), m_len(n)
+    {
+    }
+
+    bool operator==(const ::std::string& s) const {
+        return *this == s.c_str();
+    }
+    bool operator==(const char* s) const {
+        if(::std::strncmp(m_start, s, m_len) != 0)
+            return false;
+        return s[m_len] == '\0';
+    }
+
+    char operator[](size_t n) const {
+        return m_start[n];
+    }
+
+    operator ::std::string() const {
+        return ::std::string { m_start, m_start + m_len };
+    }
+    friend ::std::string& operator+=(::std::string& x, const string_view& sv) {
+        x.append(sv.m_start, sv.m_start+sv.m_len);
+        return x;
+    }
+    friend ::std::ostream& operator<<(::std::ostream& os, const string_view& sv) {
+        os.write(sv.m_start, sv.m_len);
+        return os;
+    }
+
+    const char* begin() const {
+        return m_start;
+    }
+    const char* end() const {
+        return m_start+m_len;
+    }
+};
+
+
+} // namespace helpers