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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#pragma once
#include "../../namespaces.h"
#include <vector>
#include <tuple>
namespace QDOC_CATCH_GENERATORS_UTILITIES_ABSOLUTE_NAMESPACE {
namespace QDOC_CATCH_GENERATORS_TRAITS_NAMESPACE {
/*!
* Returns the type of the first element of Args.
*
* Args is expected to have at least one
*/
template<typename... Args>
using first_from_pack_t = std::tuple_element_t<0, std::tuple<Args...>>;
} // end QDOC_CATCH_GENERATORS_TRAITS_NAMESPACE
/*!
* Builds an std::vector by moving \a movables into it.
*
* \a movables must be made of homogenous types.
*
* This function is intended to allow the construction of an
* std::vector<T>, where T is a move only type, as an expression,
* to lighten the idiom.
*
* For example, Catch's GeneratorWrapper<T> adapts a
* std::unique_ptr, which is move only, making it impossible to
* build a std::vector from them in place.
*
* Then, everywhere this is needed, a more complex approach of
* generating the collection of objects, generating a vector of a
* suitable size and iterating the objects to move-emplace them in
* the vector is required.
*
* This not only complicates the code but is incompatible with a
* GENERATE expression, making it extremely hard, noisy and error
* prone to use them together.
*
* In those cases, then, a call to move_into_vector can be used as
* an expression to circumvent the problem.
*/
template<typename... MoveOnlyTypes>
inline auto move_into_vector(MoveOnlyTypes... movables) {
std::vector<QDOC_CATCH_GENERATORS_TRAITS_NAMESPACE::first_from_pack_t<MoveOnlyTypes...>>
moved_into_vector;
moved_into_vector.reserve(sizeof...(movables));
(moved_into_vector.emplace_back(std::move(movables)), ...);
return moved_into_vector;
}
} // end QDOC_CATCH_GENERATORS_UTILITIES_ABSOLUTE_NAMESPACE
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