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In C, the rvalue reference parameter allows a function to obtain a reference to a temporary object without creating a copy. The advantages include avoiding unnecessary copies, improving performance and readability. The syntax is void func(T&& param). Note that rvalue references can only be bound to temporary objects and can only be used within functions.
Usage of C function rvalue reference parameter
In C, the rvalue reference parameter allows the function to obtain a reference to a temporary object. without creating a copy of it. This improves performance and readability.
Syntax:
void func(T&& param);
Among them:
&&
represents rvalue reference param
is Function parameter T
is of type Advantages:
Practical case:
Consider a string that converts to uppercase Function:
#include <iostream> #include <string> using namespace std; void toUpperCase(string&& str) { for (char& c : str) { c = toupper(c); } } int main() { string input = "hello"; toUpperCase(input); cout << input << endl; return 0; }
In this case, when passing input
to toUpperCase
, there is no need to copy the string as it is a temporary object. This function will modify input
directly, thus avoiding unnecessary overhead.
Output:
HELLO
Notes:
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