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Deleted functions[1] are a feature of the C++ programming language that allow the programmer to prevent specific functions from being called. The most common usage of deleted functions is when the programmer wants to disable copying of a class object.
Deleted functions were added in C++11.
Usage
editBelow is a very simple usage of deleted functions:
void printNum(int x) {
std::cout << x << '\n';
}
printNum(char) = delete;
printNum(bool) = delete;
The following code forbids the user from having a char or a boolean type as an argument for the printNum function, which are otherwise acceptable due to Integral promotion[2]. If we were to call the function and use a char or a boolean as an argument, we would get a compile error.
Deleted functions are, however, used mostly to disable copying of a class object.
Example(Example const&) = delete;
Example& operator=(Example const&) = delete;
The example above, disables the copy constructor and the copy assignment operator using the delete keyword.
See also
editReferences
edit- ^ "Function declaration - cppreference.com". en.cppreference.com. Retrieved 2024-11-09.
- ^ "Implicit conversions - cppreference.com". en.cppreference.com. Retrieved 2024-11-09.
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