int main()
{
int x = 137;
identity<int> id;
assert(x == id(x));
}
Definition Defined in the standard header functional, and in the nonstandard backward-compatibility header function.h. This class is an SGI extension; it is not part of the C++ standard. Template parameters Parameter Description Default T The function object's argument type, and return type. [1] Model ofAdaptable Unary Function Type requirements None. Public base classesunary_function<T, T> Members New members All of identity's members are defined in the Adaptable Unary Function requirements. Identity does not introduce any new members. Notes
[1] It is essential that the return type and the argument type are the same: generalizing identity to allow them to differ would not work. The reason is that identity returns a const reference to its argument, rather than a copy of its argument. If identity were allowed to perform a conversion, then this would be a dangling reference.
See also The function object overview, select1st, select2nd, project1st, project2nd STL Main PageRetroSearch is an open source project built by @garambo | Open a GitHub Issue
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