1, Moved "#include <string>" from exported header to test flag provider
header file.
2, For production target and read only flags, the generated c
api should just return default value instead of calling into c++ api
3, Remove using namespace server_configurable_flags from header, instead
of just having the namespace to be spelled out in each api call. Having
using namespace xxx in header is not a c++ best practice.
4, Replace #ifdef #def #endif with #pragma once
Bug: b/279483801
Test: atest aconfig.test
Change-Id: I3e55a7b14301f3de419795467f33e2dc889d371e
Two major changes to c/c++ codegen
(1) explicit setter for each flag instead of a generic flag setter
void override_flag(std::string name, bool val) is replaced with
void <flag name>(bool val) for each flag name
This has several advantages:
(a) generated code is more c++ idomatic
(b) no longer need to create flag name string constants
(c) any typo in the code is caught early in the build time
(2) remove flag setter and flag override reset methods/functions when
generating code targets for production. If developers want to update
their main function to take command line arg for flag overrides, they
can use compile time macros to decide if the flag override code should
be included.
Bug: b/279483801
Test: atest aconfig.test
Change-Id: I6141f7f979b32fe0426154d578edeb997ae5ff7c
Move server_configurable_flags header include away from exported header,
instead put it in the flag provider headers. Otherwise, it can cause
compilation error if the source code who wants to use the generated c flag lib has
not added dependency on server_configurable_flags yet.
Bug: b/279483801
Test: atest aconfig.test
Change-Id: Ib75877ee88f995caf72b3fd2554c3da195032c14
cpp codegen iteration 2, based on discussions with three internal teams
that use c++. Refer to the design doc "aconfig c++ codegen" for detailed
design. At a high level, we generate two sets of code artifacts with the
same signatured api: one for production that without any local flag
override capability, one for unit test that allows local flag overrides.
It supports static methods style interface as well as injection pattern.
Refer to the test points in the codegen_cpp.rs for examples of generated
code.
for production target codegen: aconfig create-cpp-lib --cache <cache> --out <out dir>
for test target codegen: aconfig create-cpp-lib --cache <cache> --out
<out dir> --mode test
Bug: b/279483801
Test: atest aconfig.test
Change-Id: I92fefb9623d5435525339a74f57bbd36d0afef08
