template_utils.hpp

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// Copyright 2021 the Autoware Foundation
//
// 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.
//
// Co-developed by Tier IV, Inc. and Apex.AI, Inc.
 
#ifndef HELPER_FUNCTIONS__TEMPLATE_UTILS_HPP_
#define HELPER_FUNCTIONS__TEMPLATE_UTILS_HPP_
 
#include <common/types.hpp>
#include <type_traits>
 
namespace autoware
{
namespace common
{
namespace helper_functions
{
template<template<typename ...> class ExpressionTemplate, typename T, typename = void>
struct expression_valid : std::false_type {};
 
template<template<typename ...> class ExpressionTemplate, typename T>
struct expression_valid<ExpressionTemplate, T,
  types::void_t<ExpressionTemplate<T>>>: std::true_type {};
 
template<template<typename ...> class ExpressionTemplate, typename T, typename ReturnT,
  typename = void>
struct expression_valid_with_return : std::false_type {};
 
template<template<typename ...> class ExpressionTemplate, typename T, typename ReturnT>
struct expression_valid_with_return<ExpressionTemplate, T, ReturnT,
  std::enable_if_t<std::is_same<ReturnT,
  ExpressionTemplate<T>>::value>>: std::true_type {};
 
 
}  // namespace helper_functions
}  // namespace common
}  // namespace autoware
#endif  // HELPER_FUNCTIONS__TEMPLATE_UTILS_HPP_