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Union methods - is(), as(), to()

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Pavel Kirienko
2015-07-10 16:13:48 +03:00
parent 263aea3542
commit 5ac6dc1fb8
1 changed files with 56 additions and 0 deletions
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libuavcan/dsdl_compiler/libuavcan_dsdl_compiler/data_type_template.tmpl
+56
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@@ -124,6 +124,28 @@ public:
static int decode(ReferenceType self, ::uavcan::ScalarCodec& codec,
::uavcan::TailArrayOptimizationMode tao_mode = ::uavcan::TailArrayOptEnabled);
% if union:
/**
* Whether the union is set to the given type.
*/
template <typename T>
bool is() const;
/**
* If the union is currently set to the type T, returns pointer to the appropriate field.
* If the union is set to another type, returns null pointer.
*/
template <typename T>
const T* as() const;
/**
* Switches the union to the given type and returns a mutable reference to the appropriate field.
* If the previous type was different, a default constructor will be executed.
*/
template <typename T>
T& to();
% endif
<!--(end)-->
% if t.kind == t.KIND_SERVICE:
@@ -280,6 +302,40 @@ ${'::uavcan::TailArrayOptDisabled' if (idx + 1) < len(fields) else 'tao_mode'});
<!--(end)-->
${generate_codec_calls_per_field(call_name='encode', self_parameter_type='ParameterType')}
${generate_codec_calls_per_field(call_name='decode', self_parameter_type='ReferenceType')}
% if union:
% for idx,a in enumerate(fields):
template <int _tmpl>
template <>
bool ${scope_prefix}::is< typename ${scope_prefix}::FieldTypes::${a.name} >() const
{
return _tag_ == ${idx};
}
% endfor
% for idx,a in enumerate(fields):
template <int _tmpl>
template <>
const T* ${scope_prefix}::as< typename ${scope_prefix}::FieldTypes::${a.name} >() const
{
return is< typename FieldTypes::${a.name} >() ? &${a.name} : NULL;
}
% endfor
% for idx,a in enumerate(fields):
template <int _tmpl>
template <>
T& ${scope_prefix}::to< ${scope_prefix}::FieldTypes::${a.name} >()
{
if (_tag_ != ${idx})
{
_tag_ = ${idx};
${a.name} = FieldTypes::${a.name}();
}
return ${a.name};
}
% endfor
% endif
<!--(end)-->
% if t.kind == t.KIND_SERVICE: