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https://issues.apache.org/jira/browse/QPID-4553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chuck Rolke resolved QPID-4553.
-------------------------------
Resolution: Won't Fix
Fix Version/s: 0.21
Changing uint8_t to behave as an integer would leave the interface with no way
to do char conversions. C++ Messaging had to make some choices when mapping
into the C language. This is issue is just a side effect of that mapping.
> C++ qpid::types::Variant::uint8_t not treated as integer during string
> conversion
> ---------------------------------------------------------------------------------
>
> Key: QPID-4553
> URL: https://issues.apache.org/jira/browse/QPID-4553
> Project: Qpid
> Issue Type: Bug
> Components: C++ Broker
> Affects Versions: 0.21
> Environment: Linux/windows broker/client Messaging
> Reporter: Chuck Rolke
> Fix For: 0.21
>
>
> There are unexpected conversion side effects when a uint8_t is created from a
> string. I expected the string value to be decoded into a binary value 0..255,
> the same as I expect for uint16_t, uint32_t, and uint64_t and their expected
> values. Instead uint8_t receives the first character of a one-character
> string as if there's an implicit string-to-single-character conversion. This
> behavior is not a regression.
> Am I mistaken expecting a 0..255 value from the .asUint8() function?
> The underlying cause is Boost being invoked through a template that works one
> way for three of the four cases and a different way for the uint8_t case. I'd
> like to get rid of that and replace it with a single, common string decode
> into a 64-bit integer. Then for the smaller subtypes mask the value down to
> the size of the respective type and throw if there's a range error.
> Here's a test where I'm looking at the recent "-0" conversion fix. In all
> cases I expect the value to be a binary zero. In the uint8_t case it is not.
> The only case where the conversion does not throw returns a value of 48 '0'.
> {code}
> void testZeroValueAs(const Variant theValue)
> {
> std::string phase;
> try
> {
> phase = "64bit - ";
> uint64_t myu64 = theValue.asUint64();
> if (myu64 != 0)
> std::cout << "Failed at uint64 : "
> << myu64 << std::endl;
> phase = "32bit - ";
> uint32_t myu32 = theValue.asUint32();
> if (myu32 != 0)
> std::cout << "Failed at uint32 : "
> << myu32 << std::endl;
> phase = "16bit - ";
> uint16_t myu16 = theValue.asUint16();
> if (myu16 != 0)
> std::cout << "Failed at uint16 : "
> << myu16 << std::endl;
> phase = "8bit - ";
> uint8_t myu8 = theValue.asUint8();
> if (myu8 != 0)
> std::cout << "Failed at uint8 : "
> << myu8 << std::endl;
> } catch (const std::exception& error) {
> std::cout << "Exception in phase "
> << phase
> << error.what()
> << std::endl;
> }
> }
> Variant value;
> value = "0";
> testZeroValueAs(value);
> value = "00";
> testZeroValueAs(value);
> value = "-00";
> testZeroValueAs(value);
> {code}
> at run time this example produces:
> {code}
> Failed at uint8 : 0
> Exception in phase 8bit - invalid conversion: Cannot convert 00
> (..\..\qpid\cpp\src\qpid\types\Variant.cpp:126)
> Exception in phase 8bit - invalid conversion: Cannot convert -00
> (..\..\qpid\cpp\src\qpid\types\Variant.cpp:126)
> {code}
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