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#include <oaidl.h>
#include <propidl.h>
#include <type_traits>
#include <utility>
#include <string_view>
#include <cassert>
#include <cstdint>
template <typename TVariant>
struct FFBaseVariant : TVariant {
bool hasValue() {
return this->vt != VT_EMPTY;
}
explicit operator bool() {
return this->hasValue();
}
template <typename T>
T get() {
// boolean
if constexpr (std::is_same_v<T, bool>) {
assert(this->vt == VT_BOOL);
return this->boolVal != VARIANT_FALSE;
}
// signed
else if constexpr (std::is_same_v<T, int8_t>) {
assert(this->vt == VT_I1);
return this->cVal;
} else if constexpr (std::is_same_v<T, int16_t>) {
assert(this->vt == VT_I2);
return this->iVal;
} else if constexpr (std::is_same_v<T, int32_t>) {
assert(this->vt == VT_I4 || this->vt == VT_INT);
return this->intVal;
} else if constexpr (std::is_same_v<T, int64_t>) {
assert(this->vt == VT_I8);
return this->llVal;
}
// unsigned
else if constexpr (std::is_same_v<T, uint8_t>) {
assert(this->vt == VT_UI1);
return this->bVal;
} else if constexpr (std::is_same_v<T, uint16_t>) {
assert(this->vt == VT_UI2);
return this->uiVal;
} else if constexpr (std::is_same_v<T, uint32_t>) {
assert(this->vt == VT_UI4 || this->vt == VT_UINT);
return this->uintVal;
} else if constexpr (std::is_same_v<T, uint64_t>) {
assert(this->vt == VT_UI8);
return this->ullVal;
}
// decimal
else if constexpr (std::is_same_v<T, float>) {
assert(this->vt == VT_R4);
return this->fltVal;
} else if constexpr (std::is_same_v<T, double>) {
assert(this->vt == VT_R8);
return this->dblVal;
}
// string
else if constexpr (std::is_same_v<T, std::string_view>) {
assert(this->vt == VT_LPSTR);
return this->pcVal;
} else if constexpr (std::is_same_v<T, std::wstring_view>) {
assert(this->vt == VT_BSTR || this->vt == VT_LPWSTR);
if (this->vt == VT_LPWSTR) {
return this->bstrVal;
} else {
return { this->bstrVal, SysStringLen(this->bstrVal) };
}
}
// array signed
else if constexpr (std::is_same_v<T, std::pair<const int8_t*, uint32_t>>) {
assert(this->vt & VT_ARRAY);
assert((this->vt & ~VT_ARRAY) == VT_I1);
return std::make_pair((int8_t*) this->parray->pvData, this->parray->cDims);
} else if constexpr (std::is_same_v<T, std::pair<const int16_t*, uint32_t>>) {
assert(this->vt & VT_ARRAY);
assert((this->vt & ~VT_ARRAY) == VT_I2);
return std::make_pair((int16_t*) this->parray->pvData, this->parray->cDims);
} else if constexpr (std::is_same_v<T, std::pair<const int32_t*, uint32_t>>) {
assert(this->vt & VT_ARRAY);
assert((this->vt & ~VT_ARRAY) == VT_I4);
return std::make_pair((int32_t*) this->parray->pvData, this->parray->cDims);
} else if constexpr (std::is_same_v<T, std::pair<const int64_t*, uint32_t>>) {
assert(this->vt & VT_ARRAY);
assert((this->vt & ~VT_ARRAY) == VT_I8);
return std::make_pair((int64_t*) this->parray->pvData, this->parray->cDims);
}
// array unsigned
else if constexpr (std::is_same_v<T, std::pair<const uint8_t*, uint32_t>>) {
assert(this->vt & VT_ARRAY);
assert((this->vt & ~VT_ARRAY) == VT_UI1);
return std::make_pair((uint8_t*) this->parray->pvData, this->parray->cDims);
} else if constexpr (std::is_same_v<T, std::pair<const uint16_t*, uint32_t>>) {
assert(this->vt & VT_ARRAY);
assert((this->vt & ~VT_ARRAY) == VT_UI2);
return std::make_pair((uint16_t*) this->parray->pvData, this->parray->cDims);
} else if constexpr (std::is_same_v<T, std::pair<const uint32_t*, uint32_t>>) {
assert(this->vt & VT_ARRAY);
assert((this->vt & ~VT_ARRAY) == VT_UI4);
return std::make_pair((uint32_t*) this->parray->pvData, this->parray->cDims);
} else if constexpr (std::is_same_v<T, std::pair<const uint64_t*, uint32_t>>) {
assert(this->vt & VT_ARRAY);
assert((this->vt & ~VT_ARRAY) == VT_UI8);
return std::make_pair((uint64_t*) this->parray->pvData, this->parray->cDims);
} else {
assert(false && "unsupported type");
__builtin_unreachable();
}
}
};
struct FFWmiVariant : FFBaseVariant<VARIANT> {
FFWmiVariant(const FFWmiVariant&) = delete;
FFWmiVariant(FFWmiVariant&&); // don't define it to enforce NRVO optimization
explicit FFWmiVariant() {
VariantInit(this);
}
explicit FFWmiVariant(std::initializer_list<PCWSTR> strings);
~FFWmiVariant() {
VariantClear(this);
}
};
static_assert(sizeof(FFWmiVariant) == sizeof(VARIANT), "");
struct FFPropVariant : FFBaseVariant<PROPVARIANT> {
FFPropVariant(const FFPropVariant&) = delete;
FFPropVariant(FFPropVariant&&); // don't define it to enforce NRVO optimization
explicit FFPropVariant() {
PropVariantInit(this);
}
~FFPropVariant() {
PropVariantClear(this);
}
};
static_assert(sizeof(FFPropVariant) == sizeof(PROPVARIANT), "");
namespace {
// Provide our bstr_t to avoid libstdc++ dependency
struct bstr_t {
explicit bstr_t(const wchar_t* str) noexcept : _bstr(SysAllocString(str)) {}
~bstr_t(void) noexcept {
SysFreeString(_bstr);
}
explicit operator const wchar_t*(void) const noexcept {
return _bstr;
}
operator BSTR(void) const noexcept {
return _bstr;
}
private:
BSTR _bstr;
};
} // namespace
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