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Introduce Overloaded helper type #165

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merged 1 commit into from
Sep 18, 2024
Merged

Introduce Overloaded helper type #165

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6 changes: 6 additions & 0 deletions include/fixed_containers/concepts.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,12 @@ struct CompileTimeValuePrinter
{
};

template <class... Ts>
struct Overloaded : Ts...
{
using Ts::operator()...;
};

// a "void-like" type, but without the hassle
// e.g. EmptyValue& is a valid type
struct EmptyValue
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18 changes: 18 additions & 0 deletions test/concepts_test.cpp
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Expand Up @@ -2,7 +2,10 @@

#include "fixed_containers/assert_or_abort.hpp"

#include <gtest/gtest.h>

#include <functional>
#include <variant>

namespace fixed_containers
{
Expand Down Expand Up @@ -51,4 +54,19 @@ static_assert(IsStructuralType<MockStructuralType>);
static_assert(ConstexprDefaultConstructible<MockNonStructuralType>);
static_assert(IsNotStructuralType<MockNonStructuralType>);

TEST(Concepts, Overloaded)
{
constexpr double RESULT = []()
{
Overloaded overloads{
[](double) -> double { return 3.0; },
[](const int&) -> double { return 5.0; },
};

std::variant<double, int> var1 = 9.0;
return std::visit(overloads, var1);
}();

static_assert(RESULT == 3.0);
}
} // namespace fixed_containers
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