cpp / intermediate
Snippet
Optimized References in Loops
When iterating over containers of objects like strings, using a 'const reference' avoids expensive copy operations for every iteration.
snippet.cpp
cpp
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#include <vector>#include <string>void process(const std::vector<std::string>& list) {for (const std::string& item : list) {// Read item without copying}}int main() {std::vector<std::string> data = {"Hello", "World"};process(data);return 0;}
Breakdown
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const std::string& item
Prevents copying the string object into the loop variable, improving performance.
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const
Ensures the loop variable cannot modify the original contents of the vector.