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9a5a13854d
* Add ctl utility.h Implements forward, move, swap, and declval. This commit also adds a def for nullptr_t to cxx.inc. We need it now because the CTL headers stopped including anything from libc++, so we no longer get their basic types. * Use ctl::swap in string The STL spec says that swap is located in the string_view header anyawy. Performance-wise this is a noop, but it’s slightly cleaner.
61 lines
1.1 KiB
C++
61 lines
1.1 KiB
C++
// -*-mode:c++;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8-*-
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// vi: set et ft=cpp ts=4 sts=4 sw=4 fenc=utf-8 :vi
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#ifndef COSMOPOLITAN_CTL_UTILITY_H_
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#define COSMOPOLITAN_CTL_UTILITY_H_
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namespace ctl {
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namespace __ {
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template<typename T>
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struct no_infer_
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{
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typedef T type;
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};
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template<typename T>
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using no_infer = typename no_infer_<T>::type;
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} // namespace __
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template<typename T>
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constexpr T&&
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move(T& t) noexcept
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{
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return static_cast<T&&>(t);
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}
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template<typename T>
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constexpr T&&
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forward(__::no_infer<T>& t) noexcept
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{
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return static_cast<T&&>(t);
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}
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template<typename T>
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// TODO(mrdomino): requires move_constructible<T> && move_assignable<T>
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constexpr void
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swap(T& a, T& b) noexcept
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{
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T t(ctl::move(a));
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a = ctl::move(b);
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b = ctl::move(t);
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}
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template<typename T, size_t N>
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// TODO(mrdomino): requires is_swappable
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constexpr void
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swap(T (&a)[N], T (&b)[N]) noexcept
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{
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for (size_t i = 0; i < N; ++i) {
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swap(a[i], b[i]);
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}
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}
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template<typename T>
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T&&
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declval() noexcept;
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} // namespace ctl
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#endif // COSMOPOLITAN_CTL_UTILITY_H_
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