BlackMATov/meta.hpp
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add value helper-functions

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BlackMATov
2021-06-30 23:28:26 +07:00
parent 4616ae46d5
commit 0d3243f4f2
3 changed files with 45 additions and 0 deletions
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2
headers/meta.hpp/meta_fwd.hpp
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@@ -8,6 +8,8 @@
#include <any> #include <any>
#include <array> #include <array>
#include <cstddef>
#include <cstdint>
#include <functional> #include <functional>
#include <map> #include <map>
#include <optional> #include <optional>

23
headers/meta.hpp/meta_value.hpp
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@@ -18,6 +18,10 @@ namespace meta_hpp
value(T&& value) value(T&& value)
: raw_{std::forward<T>(value)} {} : raw_{std::forward<T>(value)} {}
template < typename T, typename... Args >
value(std::in_place_type_t<T>, Args&&... args)
: raw_{std::in_place_type<T>, std::forward<Args>(args)...} {}
template < typename T > template < typename T >
auto cast() const { auto cast() const {
return std::any_cast<T>(raw_); return std::any_cast<T>(raw_);
@@ -32,6 +36,25 @@ namespace meta_hpp
auto try_cast() const noexcept { auto try_cast() const noexcept {
return std::any_cast<T>(&raw_); return std::any_cast<T>(&raw_);
} }
public:
bool to_bool() const { return cast<bool>(); }
int to_int() const { return cast<int>(); }
float to_float() const { return cast<float>(); }
double to_double() const { return cast<double>(); }
std::string to_string() const { return cast<std::string>(); }
std::int8_t to_int8() const { return cast<std::int8_t>(); }
std::int16_t to_int16() const { return cast<std::int16_t>(); }
std::int32_t to_int32() const { return cast<std::int32_t>(); }
std::int64_t to_int64() const { return cast<std::int64_t>(); }
std::uint8_t to_uint8() const { return cast<std::uint8_t>(); }
std::uint16_t to_uint16() const { return cast<std::uint16_t>(); }
std::uint32_t to_uint32() const { return cast<std::uint32_t>(); }
std::uint64_t to_uint64() const { return cast<std::uint64_t>(); }
std::size_t to_size_t() const { return cast<std::size_t>(); }
std::ptrdiff_t to_ptrdiff_t() const { return cast<std::ptrdiff_t>(); }
private: private:
std::any raw_; std::any raw_;
}; };

20
untests/meta_value_tests.cpp
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@@ -13,4 +13,24 @@ namespace
TEST_CASE("meta/value") { TEST_CASE("meta/value") {
namespace meta = meta_hpp; namespace meta = meta_hpp;
using namespace std::string_literals;
CHECK(meta::value{true}.to_bool() == true);
CHECK(meta::value{1}.to_int() == 1);
CHECK(meta::value{1.f}.to_float() == 1.f);
CHECK(meta::value{1.0}.to_double() == 1.0);
CHECK(meta::value{"meta"s}.to_string() == "meta");
CHECK(meta::value{std::in_place_type<std::int8_t>, 1}.to_int8() == 1);
CHECK(meta::value{std::in_place_type<std::int16_t>, 1}.to_int16() == 1);
CHECK(meta::value{std::in_place_type<std::int32_t>, 1}.to_int32() == 1);
CHECK(meta::value{std::in_place_type<std::int64_t>, 1}.to_int64() == 1);
CHECK(meta::value{std::in_place_type<std::uint8_t>, 1}.to_uint8() == 1u);
CHECK(meta::value{std::in_place_type<std::uint16_t>, 1}.to_uint16() == 1u);
CHECK(meta::value{std::in_place_type<std::uint32_t>, 1}.to_uint32() == 1u);
CHECK(meta::value{std::in_place_type<std::uint64_t>, 1}.to_uint64() == 1u);
CHECK(meta::value{std::in_place_type<std::size_t>, 1}.to_size_t() == 1u);
CHECK(meta::value{std::in_place_type<std::ptrdiff_t>, 1}.to_ptrdiff_t() == 1u);
} }