Prepend std::string

Question

What is the most efficient way to prepend std::string? Is it worth writing out an entire function to do so, or would it take only 1 - 2 lines? I\'m not seeing anyth

Answer 1

If you're using std::string::append, you should realize the following is equivalent:

std::string lhs1 = "hello ";
std::string lhs2 = "hello ";
std::string rhs = "world!";

lhs1.append(rhs);
lhs2 += rhs; // equivalent to above
// Also the same:
// lhs2 = lhs2 + rhs;

Similarly, a "prepend" would be equivalent to the following:

std::string result = "world";
result = "hello " + result;
// If prepend existed, this would be equivalent to
// result.prepend("hello");

You should note that it's rather inefficient to do the above though.