devtools/eigen
1
0
Fork 0
mirror of https://gitlab.com/libeigen/eigen.git synced 2026-04-10 11:34:33 +08:00
Code Issues Packages Projects Releases Wiki Activity

Make fixed-size Matrix and Array trivially copyable after C++20

Browse Source 
Making them trivially copyable allows using std::memcpy() without undefined
behaviors.

Only Matrix and Array with trivially copyable DenseStorage are marked as
trivially copyable with an additional type trait.

As described in http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p0848r3.html
it requires extremely verbose SFINAE to make the special member functions of
fixed-size Matrix and Array trivial, unless C++20 concepts are available to
simplify the selection of trivial special member functions given template
parameters. Therefore only make this feature available to compilers that support
C++20 P0848R3.

Fix #1855.
This commit is contained in:
Lingzhu Xiang
2022-01-07 19:04:35 +00:00
committed by David Tellenbach
parent c4b1dd2f6b
commit 47eac21072
11 changed files with 127 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
test/dense_storage.cpp
View File

@@ -20,6 +20,11 @@ static_assert(std::is_trivially_move_assignable<DenseStorageD3x3>::value, "Dense
static_assert(std::is_trivially_copy_constructible<DenseStorageD3x3>::value, "DenseStorage not trivially_copy_constructible");
static_assert(std::is_trivially_copy_assignable<DenseStorageD3x3>::value, "DenseStorage not trivially_copy_assignable");
static_assert(std::is_trivially_copyable<DenseStorageD3x3>::value, "DenseStorage not trivially_copyable");
#if EIGEN_COMP_HAS_P0848R3
static_assert(std::is_trivially_copyable<Eigen::Matrix3d>::value, "Eigen::Matrix3d not trivially_copyable");
static_assert(std::is_trivially_copyable<Eigen::Array33d>::value, "Eigen::Array33d not trivially_copyable");
static_assert(!std::is_trivially_copyable<Eigen::Matrix3<AnnoyingScalar>>::value, "Eigen::Matrix3<AnnoyingScalar> is trivially_copyable");
#endif
#endif
template <typename T, int Size, int Rows, int Cols>