mirror of
https://github.com/kidfromjupiter/nearby.git
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Alexey Polyudov
204f76077d
Signed-off-by: Alexey Polyudov <apolyudov@google.com> Change-Id: I2cf5bf225b76f4c1541954651f3a7544a14e0cec
58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
#ifndef PLATFORM_EXCEPTION_H_
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#define PLATFORM_EXCEPTION_H_
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namespace location {
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namespace nearby {
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struct Exception {
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enum Value {
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NONE,
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IO,
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INTERRUPTED,
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INVALID_PROTOCOL_BUFFER,
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EXECUTION,
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};
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};
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// ExceptionOr models the concept of the return value of a function that might
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// throw an exception.
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//
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// If ok() returns true, result() is a usable return value. Otherwise,
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// exception() explains why such a value is not present.
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//
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// A typical pattern of usage is as follows:
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//
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// if (!e.ok()) {
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// if (Exception::EXCEPTION_TYPE_1 == e.exception()) {
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// // Handle Exception::EXCEPTION_TYPE_1.
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// } else if (Exception::EXCEPTION_TYPE_2 == e.exception()) {
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// // Handle Exception::EXCEPTION_TYPE_2.
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// }
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//
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// return;
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// }
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//
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// // Use e.result().
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template <typename T>
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class ExceptionOr {
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public:
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explicit ExceptionOr(T result);
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explicit ExceptionOr(Exception::Value exception);
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bool ok() const;
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T result() const;
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Exception::Value exception() const;
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private:
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T result_;
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Exception::Value exception_;
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};
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} // namespace nearby
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} // namespace location
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#include "platform/exception.cc"
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#endif // PLATFORM_EXCEPTION_H_
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