68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
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// This is a test for a hack in Clang that works around a problem introduced by
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// DR583: it's no longer possible to compare a pointer against nullptr_t, but
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// we still want to permit those comparisons within less<> and friends.
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// RUN: %clang_cc1 -verify %s -std=c++14
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namespace std {
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template<typename T = void> struct less {};
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template<typename T = void> struct less_equal {};
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template<typename T = void> struct greater {};
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template<typename T = void> struct greater_equal {};
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template<> struct less<> {
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template <class T1, class T2>
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auto operator()(T1 &&t, T2 &&u) const noexcept(noexcept(t < u))
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-> decltype(t < u) {
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return t < u;
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}
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};
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template<> struct less_equal<> {
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template <class T1, class T2>
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auto operator()(T1 &&t, T2 &&u) const noexcept(noexcept(t <= u))
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-> decltype(t <= u) {
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return t <= u;
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}
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};
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template<> struct greater<> {
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template <class T1, class T2>
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auto operator()(T1 &&t, T2 &&u) const noexcept(noexcept(t > u))
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-> decltype(t > u) {
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return t > u;
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}
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};
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template<> struct greater_equal<> {
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template <class T1, class T2>
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auto operator()(T1 &&t, T2 &&u) const noexcept(noexcept(t >= u))
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-> decltype(t >= u) {
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return t >= u;
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}
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};
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template<typename = void> struct unrelated;
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template<> struct unrelated<> {
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template <class T1, class T2>
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auto operator()(T1 &&t, T2 &&u) const noexcept(noexcept(t < u)) // expected-note {{substitution failure}}
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-> decltype(t < u) {
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return t < u;
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}
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};
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};
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void test(int *p) {
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using namespace std;
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less<>()(p, nullptr);
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less<>()(nullptr, p);
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less_equal<>()(p, nullptr);
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less_equal<>()(nullptr, p);
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greater<>()(p, nullptr);
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greater<>()(nullptr, p);
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greater_equal<>()(p, nullptr);
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greater_equal<>()(nullptr, p);
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unrelated<>()(p, nullptr); // expected-error {{no matching function}}
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}
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