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xn65/includes/xna/helpers.hpp

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#ifndef XNA_HELPERS_HPP
#define XNA_HELPERS_HPP
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#include "default.hpp"
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namespace xna {
//Class for helper functions
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struct XnaHelper {
//
// Smart Pointer Comparator
//
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template<typename T> struct is_shared_ptr : std::false_type {};
template<typename T> struct is_shared_ptr<std::shared_ptr<T>> : std::true_type {};
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template<typename T> struct is_weak_ptr : std::false_type {};
template<typename T> struct is_weak_ptr<std::weak_ptr<T>> : std::true_type {};
template<typename T> struct is_unique_ptr : std::false_type {};
template<typename T> struct is_unique_ptr<std::unique_ptr<T>> : std::true_type {};
//Returns true if the type is a smart pointer
template <typename T>
static constexpr bool IsSmartPoint() {
return is_shared_ptr<T>::value || is_unique_ptr<T>::value || is_weak_ptr<T>::value;
}
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//Convert a string to wstring
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static inline std::wstring ToWString(const std::string& str)
{
std::wstring wstr;
size_t size;
wstr.resize(str.length());
mbstowcs_s(&size, &wstr[0], wstr.size() + 1, str.c_str(), str.size());
return wstr;
}
//Convert a wstring to string
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static inline std::string ToString(const std::wstring& wstr)
{
std::string str;
size_t size;
str.resize(wstr.length());
wcstombs_s(&size, &str[0], str.size() + 1, wstr.c_str(), wstr.size());
return str;
}
//Returns a hash reporting input values
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template <class T>
static constexpr void HashCombine(std::size_t& seed, const T& v) {
std::hash<T> hasher;
seed ^= hasher(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
}
//Returns null if the type is a smart pointer or default value if the type has a default constructor.
//Throws an exception if the object cannot be created
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template<typename T>
static inline auto ReturnDefaultOrNull(const std::source_location location = std::source_location::current()) {
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if constexpr (IsSmartPoint<T>())
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return (T)nullptr;
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else if constexpr (std::is_default_constructible<T>::value)
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return T();
else
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Exception::Throw(Exception::UNABLE_TO_BUILD_OBJECT, location);
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}
};
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}
#endif