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57 lines
2.0 KiB
C++
57 lines
2.0 KiB
C++
/*<-
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Copyright Barrett Adair 2016
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Distributed under the Boost Software License, Version 1.0.
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(See accompanying file LICENSE.md or copy at http ://boost.org/LICENSE_1_0.txt)
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->*/
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//[ add_function_rvalue
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#include <type_traits>
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#include <callable_traits/add_function_rvalue.hpp>
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namespace ct = callable_traits;
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struct foo {};
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int main() {
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{
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using pmf = void(foo::*)();
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using expect = void(foo::*)() &&;
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using test = ct::add_function_rvalue<pmf>;
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static_assert(std::is_same<test, expect>::value, "");
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} {
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// add_function_rvalue doesn't change anything when
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// the function type already has an rvalue qualifier.
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using pmf = void(foo::*)() &&;
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using expect = void(foo::*)() &&;
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using test = ct::add_function_rvalue<pmf>;
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static_assert(std::is_same<test, expect>::value, "");
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} {
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// add_function_rvalue models C++11 reference collapsing
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// rules, so that adding an rvalue qualifier to an
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// lvalue-qualified type will not change anything.
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using pmf = void(foo::*)() const &;
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using expect = void(foo::*)() const &;
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using test = ct::add_function_rvalue<pmf>;
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static_assert(std::is_same<test, expect>::value, "");
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} {
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// add_function_rvalue can also be used with "abominable"
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// function types.
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using f = void() const;
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using expect = void() const &&;
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using test = ct::add_function_rvalue<f>;
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static_assert(std::is_same<test, expect>::value, "");
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} {
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// add_function_rvalue does not compile with function pointers,
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// function references, function objects, or member data pointers.
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// However, you can loosen this restriction somewhat by using the
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// callable_traits::permissive namespace instead:
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using f = void(*)();
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using expect = f;
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using test = ct::permissive::add_function_rvalue<f>;
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static_assert(std::is_same<test, expect>::value, "");
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}
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}
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//]
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