libcruft-util/test/traits.cpp

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#include "tap.hpp"
#include "types/traits.hpp"
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#include <list>
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///////////////////////////////////////////////////////////////////////////////
template <typename FuncT>
constexpr bool
returns_int (FuncT)
{
return std::is_same_v<
int,
typename func_traits<FuncT>::return_type
>;
}
///////////////////////////////////////////////////////////////////////////////
template <typename, class = std::void_t<>>
struct has_return_type : std::false_type {};
//-----------------------------------------------------------------------------
template <typename T>
struct has_return_type<
T, std::void_t<typename func_traits<T>::return_type>
> : std::true_type {};
///////////////////////////////////////////////////////////////////////////////
extern int plain (char, float) { return 0; }
extern int with_noexcept (char, float) noexcept { return 0; }
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struct foo {
int bar (double, char) const { return 0; }
int with_noexcept (double, char) noexcept { return 0; }
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};
///////////////////////////////////////////////////////////////////////////////
int
main (void)
{
cruft::TAP::logger tap;
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tap.expect (returns_int ( plain), "free-function by-reference");
tap.expect (returns_int (&plain), "free-function by-pointer");
tap.expect (returns_int ( with_noexcept), "free-function with noexcept by-reference");
tap.expect (returns_int (&with_noexcept), "free-function with noexcept by-pointer");
tap.expect (returns_int (&foo::bar), "member-function by reference");
tap.expect (returns_int (&foo::with_noexcept), "member-function with noexcept by reference");
using all_t = void (*const &)(void *, unsigned int, unsigned int, void **) noexcept;
tap.expect (std::is_same_v<void, typename func_traits<all_t>::return_type>,
"complex function type");
tap.expect (!has_return_type<int>::value, "integer is not applicable to func_traits");
tap.expect (is_contiguous_v<std::vector<char>>, "vector is contiguous");
tap.expect (is_contiguous_v<std::array<char,4>>, "array is contiguous");
tap.expect (!is_contiguous_v<std::list<char>>, "list is not contiguous");
tap.expect ( cruft::is_same_basic_type_v<float,double>, "float-double same_basic_type");
tap.expect (!cruft::is_same_basic_type_v<float,int>, "float-int same_basic_type");
return tap.status ();
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}