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#pragma once
#include <assert.h>
#include <stdint.h>
#include <stdexcept>
#include <string>
#include <utility>
#include <type_traits>
#include <c10/core/ScalarType.h>
#include <c10/macros/Macros.h>
#include <c10/util/Half.h>
#include <c10/util/TypeCast.h>
namespace c10 {
/**
* Scalar represents a 0-dimensional tensor which contains a single element.
* Unlike a tensor, numeric literals (in C++) are implicitly convertible to
* Scalar (which is why, for example, we provide both add(Tensor) and
* add(Scalar) overloads for many operations). It may also be used in
* circumstances where you statically know a tensor is 0-dim and single size,
* but don't know its type.
*/
class C10_API Scalar {
public:
Scalar() : Scalar(int64_t(0)) {}
#define DEFINE_IMPLICIT_CTOR(type, name) \
Scalar(type vv) : Scalar(vv, true) { }
AT_FORALL_SCALAR_TYPES_AND2(Half, BFloat16, DEFINE_IMPLICIT_CTOR)
AT_FORALL_COMPLEX_TYPES(DEFINE_IMPLICIT_CTOR)
#undef DEFINE_IMPLICIT_CTOR
// Value* is both implicitly convertible to SymbolicVariable and bool which
// causes ambiguity error. Specialized constructor for bool resolves this
// problem.
template <
typename T,
typename std::enable_if<std::is_same<T, bool>::value, bool>::type* =
nullptr>
Scalar(T vv) : tag(Tag::HAS_b) {
v.i = convert<int64_t, bool>(vv);
}
#define DEFINE_ACCESSOR(type, name) \
type to##name() const { \
if (Tag::HAS_d == tag) { \
return checked_convert<type, double>(v.d, #type); \
} else if (Tag::HAS_z == tag) { \
return checked_convert<type, c10::complex<double>>( \
v.z, #type); \
} if (Tag::HAS_b == tag) { \
return checked_convert<type, bool>(v.i, #type); \
} else { \
return checked_convert<type, int64_t>(v.i, #type); \
} \
}
// TODO: Support ComplexHalf accessor
AT_FORALL_SCALAR_TYPES_WITH_COMPLEX_EXCEPT_COMPLEX_HALF(DEFINE_ACCESSOR)
// also support scalar.to<int64_t>();
template <typename T>
T to() const;
#undef DEFINE_ACCESSOR
bool isFloatingPoint() const {
return Tag::HAS_d == tag;
}
C10_DEPRECATED_MESSAGE("isIntegral is deprecated. Please use the overload with 'includeBool' parameter instead.")
bool isIntegral() const {
return Tag::HAS_i == tag;
}
bool isIntegral(bool includeBool) const {
return Tag::HAS_i == tag || (includeBool && isBoolean());
}
bool isComplex() const {
return Tag::HAS_z == tag;
}
bool isBoolean() const {
return Tag::HAS_b == tag;
}
Scalar operator-() const;
ScalarType type() const {
if (isComplex()) {
return ScalarType::ComplexDouble;
} else if (isFloatingPoint()) {
return ScalarType::Double;
} else if (isIntegral(/*includeBool=*/false)) {
return ScalarType::Long;
} else if (isBoolean()) {
return ScalarType::Bool;
} else {
throw std::runtime_error("Unknown scalar type.");
}
}
private:
template<typename T,
typename std::enable_if<std::is_integral<T>::value && ! std::is_same<T, bool>::value, bool>::type* =
nullptr>
Scalar(T vv, bool) : tag(Tag::HAS_i) {
v.i = convert<decltype(v.i), T>(vv);
}
template<typename T,
typename std::enable_if<!std::is_integral<T>::value && !c10::is_complex<T>::value, bool>::type* =
nullptr>
Scalar(T vv, bool) : tag(Tag::HAS_d) {
v.d = convert<decltype(v.d), T>(vv);
}
template<typename T,
typename std::enable_if<c10::is_complex<T>::value, bool>::type* =
nullptr>
Scalar(T vv, bool) : tag(Tag::HAS_z) {
v.z = convert<decltype(v.z), T>(vv);
}
// We can't set v in the initializer list using the
// syntax v{ .member = ... } because it doesn't work on MSVC
enum class Tag { HAS_d, HAS_i, HAS_z, HAS_b };
Tag tag;
union v_t {
double d;
int64_t i;
c10::complex<double> z;
v_t(){} // default constructor
} v;
};
// define the scalar.to<int64_t>() specializations
template <typename T>
inline T Scalar::to() const {
throw std::runtime_error("to() cast to unexpected type.");
}
#define DEFINE_TO(T, name) \
template <> \
inline T Scalar::to<T>() const { \
return to##name(); \
}
AT_FORALL_SCALAR_TYPES_WITH_COMPLEX_EXCEPT_COMPLEX_HALF(DEFINE_TO)
#undef DEFINE_TO
} // namespace c10
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