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Add to_array

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This commit is contained in:
Peter Dimov
2025-02-23 20:45:50 +02:00
parent 9b508e3ad2
commit 37289c5d92
3 changed files with 163 additions and 10 deletions
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65
include/boost/array.hpp
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@ -430,17 +430,62 @@ namespace boost {
return arg.elems; return arg.elems;
} }
template <size_t Idx, typename T, size_t N> template <size_t Idx, typename T, size_t N>
BOOST_CXX14_CONSTEXPR T &get(boost::array<T,N> &arr) BOOST_NOEXCEPT { BOOST_CXX14_CONSTEXPR T &get(boost::array<T,N> &arr) BOOST_NOEXCEPT
BOOST_STATIC_ASSERT_MSG ( Idx < N, "boost::get<>(boost::array &) index out of range" ); {
return arr[Idx]; BOOST_STATIC_ASSERT_MSG ( Idx < N, "boost::get<>(boost::array &) index out of range" );
} return arr[Idx];
}
template <size_t Idx, typename T, size_t N> template <size_t Idx, typename T, size_t N>
BOOST_CONSTEXPR const T &get(const boost::array<T,N> &arr) BOOST_NOEXCEPT { BOOST_CONSTEXPR const T &get(const boost::array<T,N> &arr) BOOST_NOEXCEPT
BOOST_STATIC_ASSERT_MSG ( Idx < N, "boost::get<>(const boost::array &) index out of range" ); {
return arr[Idx]; BOOST_STATIC_ASSERT_MSG ( Idx < N, "boost::get<>(const boost::array &) index out of range" );
} return arr[Idx];
}
template<class T, std::size_t N>
BOOST_CXX14_CONSTEXPR array<T, N> to_array( T const (&a)[ N ] )
{
array<T, N> r = {};
for( std::size_t i = 0; i < N; ++i )
{
r[ i ] = a[ i ];
}
return r;
}
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template<class T, std::size_t N>
BOOST_CXX14_CONSTEXPR array<T, N> to_array( T (&&a)[ N ] )
{
array<T, N> r = {};
for( std::size_t i = 0; i < N; ++i )
{
r[ i ] = std::move( a[ i ] );
}
return r;
}
template<class T, std::size_t N>
BOOST_CXX14_CONSTEXPR array<T, N> to_array( T const (&&a)[ N ] )
{
array<T, N> r = {};
for( std::size_t i = 0; i < N; ++i )
{
r[ i ] = a[ i ];
}
return r;
}
#endif
} /* namespace boost */ } /* namespace boost */

1
test/Jamfile.v2
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@ -84,6 +84,7 @@ run array_eq_test.cpp ;
run array_lt_test.cpp ; run array_lt_test.cpp ;
run array_thw_test.cpp ; run array_thw_test.cpp ;
run array_get_test.cpp ; run array_get_test.cpp ;
run to_array_test.cpp ;
# C++11 constexpr # C++11 constexpr

107
test/to_array_test.cpp Normal file
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@ -0,0 +1,107 @@
// Copyright 2025 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt)
#include <boost/array.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/config.hpp>
#include <boost/config/workaround.hpp>
#include <memory>
#include <utility>
boost::array<int, 3> f1()
{
boost::array<int, 3> r = {{ 1, 2, 3 }};
return r;
}
boost::array<int, 3> const f2()
{
boost::array<int, 3> r = {{ 1, 2, 3 }};
return r;
}
int main()
{
{
int a[] = { 1, 2, 3 };
boost::array<int, 3> b = boost::to_array( a );
BOOST_TEST_EQ( b[0], 1 );
BOOST_TEST_EQ( b[1], 2 );
BOOST_TEST_EQ( b[2], 3 );
}
{
int const a[] = { 1, 2, 3 };
boost::array<int, 3> b = boost::to_array( a );
BOOST_TEST_EQ( b[0], 1 );
BOOST_TEST_EQ( b[1], 2 );
BOOST_TEST_EQ( b[2], 3 );
}
{
boost::array<int, 3> b = boost::to_array( f1().elems );
BOOST_TEST_EQ( b[0], 1 );
BOOST_TEST_EQ( b[1], 2 );
BOOST_TEST_EQ( b[2], 3 );
}
{
boost::array<int, 3> b = boost::to_array( f2().elems );
BOOST_TEST_EQ( b[0], 1 );
BOOST_TEST_EQ( b[1], 2 );
BOOST_TEST_EQ( b[2], 3 );
}
#if BOOST_CXX_VERSION >= 201103L
#if !BOOST_WORKAROUND(BOOST_MSVC, < 1910)
{
int a[] = { 1, 2, 3 };
boost::array<int, 3> b = boost::to_array( std::move( a ) );
BOOST_TEST_EQ( b[0], 1 );
BOOST_TEST_EQ( b[1], 2 );
BOOST_TEST_EQ( b[2], 3 );
}
{
int const a[] = { 1, 2, 3 };
boost::array<int, 3> b = boost::to_array( std::move( a ) );
BOOST_TEST_EQ( b[0], 1 );
BOOST_TEST_EQ( b[1], 2 );
BOOST_TEST_EQ( b[2], 3 );
}
#endif
{
boost::array<int, 3> b = boost::to_array({ 1, 2, 3 });
BOOST_TEST_EQ( b[0], 1 );
BOOST_TEST_EQ( b[1], 2 );
BOOST_TEST_EQ( b[2], 3 );
}
#if !BOOST_WORKAROUND(BOOST_MSVC, < 1920)
{
std::unique_ptr<int> a[] = { {}, {}, {} };
boost::array<std::unique_ptr<int>, 3> b = boost::to_array( std::move( a ) );
(void)b;
}
#endif
#endif
return boost::report_errors();
}