In my program I need to check the first character of a std::string, and use something like this:
if(string.front() == '-')
I wonder, does using the code below instead make any difference?
if(string[0] == '-')
Is there a difference between std::string's front() and [0]?
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2 Answers
From the reference for string::front:
Effects: Equivalent to:
return operator[](0);
So there is no difference between the 2 snippets of code you've shown.
Both front() and operator[] returns reference to element, so no difference;
If you needs bounds checking you can use std::string::at, which does the boundary checking and throws std::out_of_range exception.
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