I have a variable that's guaranteed to be a single character (substr from a std::string
).
I strongly suspect that it's more efficient to use a char
, ie
char c = name.c_str()[offset];
instead of the more complicated (and costly)
std::string c = name.substr(offset, 1);
I'm not going to do any intensive operations on the resulting character (just one switch
statement).
It is probably better to use a char
in this case, assuming you want to store it and process it often latter, otherwise you can just directly access the string
individual char
s using operator[]
. One thing to note is that std::string
implements the so-called short string optimization , which should be quite fast. But anyway, you should profile your code , and unless you need a std::string
(eg to be passed around latter in some other functions), you should just use a char
.
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