sdbus++: generate `properties` method for client harness

This uses the existing proxy `get_all_properties` method and allows for
more efficient fetching of all properties in one shot. A struct is
ge

sdbus++: generate `properties` method for client harness

This uses the existing proxy `get_all_properties` method and allows for
more efficient fetching of all properties in one shot. A struct is
generated for each type, and each field is initialized with its default
value (but is not guaranteed to be deserialized).

As errors are less detectable (e.g. perhaps an expected property
did not come through?), I considered whether the values in the struct
should all be `std::optional`. However, given how other methods are
used, it feels like this would result in a crash and assertion
failure rather than saving anyone time and effort. The wrong type
is detected a suitable exception is thrown in those cases.

Change-Id: Iff7712bd17db39f1ee5699f867e9f17a54eea21b
Signed-off-by: Adin Scannell <adin@scannell.ca>

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example:calculator: Add property overrides

Add examples of how to override the get and set property calls.

Change-Id: I1436ed7c286aa141ffb63a6af8c4766bf764f74b
Signed-off-by: Matt Spinler <spinler@

example:calculator: Add property overrides

Add examples of how to override the get and set property calls.

Change-Id: I1436ed7c286aa141ffb63a6af8c4766bf764f74b
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

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example: calculator: use YAML paths and service_names support

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ia2a51f5c9ef62715b9e65e3935c64d6da7a49f31

sdbus++: async: client: make methods snake_case to match server

Use snake_case in generated bindings to match the server bindings
naming convention.

Signed-off-by: Patrick Williams <patrick@stwcx.x

sdbus++: async: client: make methods snake_case to match server

Use snake_case in generated bindings to match the server bindings
naming convention.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I17c89a2e85cd4906bbfe1eaab86ab0b1837aad88

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sdbus++: async: client: fix client_t usage

When using the "Alternatively,..." syntax from calculator-client, we
end up with the compiler error:

```
example/gen/net/poettering/Calculator/client.hpp:

sdbus++: async: client: fix client_t usage

When using the "Alternatively,..." syntax from calculator-client, we
end up with the compiler error:

```
example/gen/net/poettering/Calculator/client.hpp:149:40: error: ‘constexpr sdbusplus::client::net::poettering::details::Calculator<Proxy>::Calculator(sdbusplus::async::context&, Proxy) [with Proxy = sdbusplus::async::proxy_ns::proxy<true, true, false, false>]’ is private within this context
149 | std::forward<Args>(args)...)
```

Fix this by making the generated alias class a friend of the details
class, in addition to the client_t proxy. Add a compile test to ensure
this works. Fix up a few whitespace alignment to better match
clang-format expectations.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ie0def6e6c96acc287c002c157d93016b4a79015c

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sdbus++: async: client: example: add a few comments for clarity

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Idf21e9652c005203a3f563b46605354e4711183d

sdbus++: async: client: add generated property calls

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I25ad8c0c167af0a55e235e5a7b4a46a3019d94ae

sdbus++: async: client: move context to constructor

The async::context is needed for every client invocation, since that
is how the async task is generated. Rather than pass it in as a
parameter on

sdbus++: async: client: move context to constructor

The async::context is needed for every client invocation, since that
is how the async task is generated. Rather than pass it in as a
parameter on each function invocation, add it as a constructor to the
client-proxy object.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic1c8ec2260b7d4774649de9559df466058a50e14

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sdbus++: async: client: add generated method calls

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I47cf5bc96b545dfe3f917655b5b94db8dac9c101

sdbus++: add start of an async client

Add generator mako templates to generate a simple async client, a
corresponding implementation of the 'calculator' interface as a
client, and a client aggregati

sdbus++: add start of an async client

Add generator mako templates to generate a simple async client, a
corresponding implementation of the 'calculator' interface as a
client, and a client aggregation class (client_t) similar to the
server aggregation class we have (sdbusplus::server::object_t).

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6795b2d051bf4d759cb319a9388b23e29d140244

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