forked from TartanLlama/optional
34 lines
776 B
C++
34 lines
776 B
C++
#include "catch.hpp"
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#include <tl/optional.hpp>
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#include <type_traits>
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struct foo{
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int& v() { return i; }
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int i = 0;
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};
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int& x(int& i) { i = 42; return i;}
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TEST_CASE("issue 14") {
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tl::optional<foo> f = foo{};
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auto v = f.map(&foo::v).map(x);
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static_assert(std::is_same<decltype(v), tl::optional<int&>>::value, "Must return a reference");
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REQUIRE(f->i == 42);
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REQUIRE(*v == 42);
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REQUIRE((&f->i) == (&*v));
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}
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struct fail_on_copy_self {
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int value;
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fail_on_copy_self(int v) : value(v) {}
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fail_on_copy_self(const fail_on_copy_self& other) : value(other.value) {
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REQUIRE(&other != this);
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}
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};
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TEST_CASE("issue 15") {
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tl::optional<fail_on_copy_self> o = fail_on_copy_self(42);
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o = o;
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REQUIRE(o->value == 42);
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} |