buffer: add an exception with an error code

This allows e.g. raw buffer constructors to provide more specific information about what failed, as well as a useful error string automatically. Signed-off-by: Josh Durgin <[email protected]>
dragonylffly · Nov 23, 2013 · eb94b8f · eb94b8f
1 parent 30bc0e2
commit eb94b8f
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diff --git a/src/common/buffer.cc b/src/common/buffer.cc
@@ -69,6 +69,8 @@ static uint32_t simple_spinlock_t buffer_debug_lock = SIMPLE_SPINLOCK_INITIALIZE
     return buffer_cached_crc_adjusted.read();
   }
 
+  buffer::error_code::error_code(int error) :
+    buffer::malformed_input(cpp_strerror(error).c_str()), code(error) {}
 
   class buffer::raw {
   public:

diff --git a/src/include/buffer.h b/src/include/buffer.h
@@ -101,6 +101,10 @@ class buffer {
   private:
     char buf[256];
   };
+  struct error_code : public malformed_input {
+    explicit error_code(int error);
+    int code;
+  };
 
 
   /// total bytes allocated