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@@ -46,3 +46,19 @@ int snprintf( char *buffer, size_t buf_size, const char *format, ... );//可变
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+> Copies count bytes from the object pointed to by src to the object pointed to by dest. Both objects are reinterpreted as arrays of unsigned char. If the objects overlap, the behavior is undefined. If either dest or src is a potentially-overlapping subobject (e.g., a field in a C-compatible struct) or is not TriviallyCopyable (e.g., scalar, C-compatible struct, or an array thereof), the behavior is undefined. If count is zero, the function does nothing.
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