79f14e6e0b
Add example binary for testing building the SDK after 'git clone' from our repo. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=227583629
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright 2017 Google LLC.
|
|
//
|
|
// This software is licensed under the terms defined in the Widevine Master
|
|
// License Agreement. For a copy of this agreement, please contact
|
|
// widevine-licensing@google.com.
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef UTIL_ERROR_SPACE_H_
|
|
#define UTIL_ERROR_SPACE_H_
|
|
|
|
#include <string>
|
|
|
|
namespace widevine {
|
|
namespace util {
|
|
|
|
class ErrorSpace {
|
|
public:
|
|
std::string SpaceName() const { return space_name_func_(this); }
|
|
std::string String(int code) const { return code_to_string_func_(this, code); }
|
|
|
|
protected:
|
|
// typedef instead of using statements for SWIG compatibility.
|
|
typedef std::string (*SpaceNameFunc)(const ErrorSpace* space);
|
|
typedef std::string (*CodeToStringFunc)(const ErrorSpace* space, int code);
|
|
constexpr ErrorSpace(SpaceNameFunc space_name_func,
|
|
CodeToStringFunc code_to_string_func)
|
|
: space_name_func_(space_name_func),
|
|
code_to_string_func_(code_to_string_func) {}
|
|
|
|
private:
|
|
const SpaceNameFunc space_name_func_;
|
|
const CodeToStringFunc code_to_string_func_;
|
|
};
|
|
|
|
// Manages creation of error space subclasses.
|
|
template <typename T>
|
|
class ErrorSpaceImpl : public ErrorSpace {
|
|
public:
|
|
constexpr ErrorSpaceImpl()
|
|
: ErrorSpace(&ErrorSpaceImpl::SpaceNameImpl,
|
|
&ErrorSpaceImpl::CodeToStringImpl) {}
|
|
|
|
// Returns the canonical instance of the `T` error space.
|
|
static constexpr const T* Get();
|
|
|
|
private:
|
|
// These functions adapt the stateful implementation that takes a space
|
|
// pointer to stateless static methods, so that clients of ErrorSpaceImpl are
|
|
// safe to have constexpr global instances.
|
|
static std::string SpaceNameImpl(const ErrorSpace* /*space*/) {
|
|
return T::space_name();
|
|
}
|
|
|
|
static std::string CodeToStringImpl(const ErrorSpace* /*space*/, int code) {
|
|
return T::code_to_string(code);
|
|
}
|
|
};
|
|
|
|
namespace internal {
|
|
|
|
// Provides a global constexpr instance of the error space `T`.
|
|
// We need the indirection because ErrorSpaceImpl can't declare constexpr
|
|
// instances of T since it is not yet fully declared.
|
|
template <typename T>
|
|
struct ErrorSpaceInstance {
|
|
static constexpr T value = {};
|
|
};
|
|
|
|
template <typename T>
|
|
constexpr T ErrorSpaceInstance<T>::value;
|
|
|
|
} // namespace internal
|
|
|
|
template <typename T>
|
|
constexpr const T* ErrorSpaceImpl<T>::Get() {
|
|
return &internal::ErrorSpaceInstance<T>::value;
|
|
}
|
|
|
|
} // namespace util
|
|
} // namespace widevine
|
|
|
|
#endif // UTIL_ERROR_SPACE_H_
|