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I have a char* buffer and I am interested in looking at the first byte in the char* buffer, what is the most optimal way to go about this.
EDIT: Based on the negative votes I might want to explain why this question, I am aware of methods but in the code base that I have been looking for getting first byte people do all kinds of crazy things like do a copy of the buffer , copy it to a stream and then do a get.
601
Even if you think of a “character” as a multi-byte thingy, char is not. sizeof(char) is always exactly 1. No exceptions, ever.
The char buf[] is a placeholder for a string. Since the max length of the string is not known at compiletime, the struct reserves the name for it, so it can be properly adressed.
first, the char variable is defined in charType and the char array in arr. Then, the size of the char variable is calculated using sizeof() operator. Then the size of the char array is find by dividing the size of the complete array by the size of the first variable.
Char buffers can be created either by allocation , which allocates space for the buffer's content, by wrapping an existing char array or string into a buffer, or by creating a view of an existing byte buffer. Like a byte buffer, a char buffer is either direct or non-direct.
Just use
char firstByte = buffer[0];
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