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document how to convert enum class flags to boolean and fix RsFlags << operator

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sehraf 2020-02-10 18:04:34 +01:00
parent 1a7510b2c9
commit dfc7212c23
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1 changed files with 10 additions and 3 deletions
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13
libretroshare/src/retroshare/rsflags.h
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@ -36,7 +36,13 @@ using rs_is_scoped_enum = std::integral_constant< bool,
* it as flags type passing it as parameter of this macro.
* The result will be type safe flags, that cannot be mixed up with flag of a
* different type, but that are very comfortable to operate like plain old
* integers.
* integers. All commom operation like &, | or ! can be used. To convert
* the result of such operation to boolean use !!:
@code{.cpp}
RsConnectModes connect = rsConfig->getConnectModes();
if (!!(connect & RsConnectModes::OUTGOING_TCP))
@endcode
*
* This macro support flag fields of different lenght depending on what
* underlining type (usually from uint8_t up to uint64_t) has been declared for
* the enum class.
@ -44,6 +50,7 @@ using rs_is_scoped_enum = std::integral_constant< bool,
* underlining type of the enum otherwise different compilers may serialize a
* flag variable with different lenght, potentially causing interoperability
* issues between differents builds.
*
* Usage example:
@code{.cpp}
enum class RsGrouterItemFlags : uint32_t
@ -129,9 +136,9 @@ operator <<(std::ostream& stream, EFT flags)
{
using u_t = typename std::underlying_type<EFT>::type;
for(int i = sizeof(u_t); i>=0; --i)
for(int i = sizeof(u_t) << 3; i>=0; --i)
{
stream << (flags & ( 1 << i ) ? "1" : "0");
stream << ((static_cast<u_t>(flags) & ( 1 << i )) ? "1" : "0");
if( i % 8 == 0 ) stream << " ";
}
return stream;