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Generate an nxtcpp_traits.h with metaprogramming helpers 

The files currently has Builder and BuiltObject template type aliases to
go from builder type to built object type or vice-versa.
This commit is contained in:
Corentin Wallez 2017-05-29 15:31:28 -04:00 committed by Corentin Wallez
parent 230daf56ad
commit 635d7d599f
2 changed files with 44 additions and 0 deletions
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1
generator/main.py
View File

@ -397,6 +397,7 @@ def main():
additional_params = {'native_methods': lambda typ: cpp_native_methods(api_params['types'], typ)}
renders.append(FileRender('apicpp.h', 'nxt/nxtcpp.h', [base_params, api_params, additional_params]))
renders.append(FileRender('apicpp.cpp', 'nxt/nxtcpp.cpp', [base_params, api_params, additional_params]))
renders.append(FileRender('apicpp_traits.h', 'nxt/nxtcpp_traits.h', [base_params, api_params, additional_params]))
if 'mock_nxt' in targets:
renders.append(FileRender('mock_api.h', 'mock/mock_nxt.h', [base_params, api_params, c_params]))

43
generator/templates/apicpp_traits.h Normal file
View File

@ -0,0 +1,43 @@
//* Copyright 2017 The NXT Authors
//*
//* Licensed under the Apache License, Version 2.0 (the "License");
//* you may not use this file except in compliance with the License.
//* You may obtain a copy of the License at
//*
//* http://www.apache.org/licenses/LICENSE-2.0
//*
//* Unless required by applicable law or agreed to in writing, software
//* distributed under the License is distributed on an "AS IS" BASIS,
//* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//* See the License for the specific language governing permissions and
//* limitations under the License.
#ifndef NXTCPP_TRAITS_H
#define NXTCPP_TRAITS_H
#include "nxtcpp.h"
#include <type_traits>
namespace nxt {
template<typename Builder>
using BuiltObject = decltype(std::declval<Builder>().GetResult());
template<typename BuiltObject>
struct BuiltObjectTrait {
};
{% for type in by_category["object"] if type.is_builder %}
template<>
struct BuiltObjectTrait<BuiltObject<{{as_cppType(type.name)}}>> {
using Builder = {{as_cppType(type.name)}};
};
{% endfor %}
template<typename BuiltObject>
using Builder = typename BuiltObjectTrait<BuiltObject>::Builder;
};
#endif // NXTCPP_TRAITS_H