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Move Eigen::all,last,lastp1,lastN to Eigen::placeholders::.

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These names are so common, IMO they should not exist directly in the
`Eigen::` namespace.  This prevents us from using the `last` or `all`
names for any parameters or local variables, otherwise spitting out
warnings about shadowing or hiding the global values.  Many external
projects (and our own examples) also heavily use
```
using namespace Eigen;
```
which means these conflict with external libraries as well, e.g.
`std::fill(first,last,value)`.

It seems originally these were placed in a separate namespace
`Eigen::placeholders`, which has since been deprecated.  I propose
to un-deprecate this, and restore the original locations.

These symbols are also imported into `Eigen::indexing`, which
additionally imports `fix` and `seq`. An alternative is to remove the
`placeholders` namespace and stick with `indexing`.

NOTE: this is an API-breaking change.

Fixes #2321.
This commit is contained in:
Antonio Sanchez
2021-09-15 14:10:29 -07:00
parent 44da7a3b9d
commit 5dac0b53c9
10 changed files with 83 additions and 57 deletions
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7
test/indexed_view.cpp
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@@ -36,7 +36,12 @@
#include <vector>
#include "main.h"
using Eigen::placeholders::all;
using Eigen::placeholders::last;
using Eigen::placeholders::lastp1;
#if EIGEN_HAS_CXX11
using Eigen::placeholders::lastN;
#include <array>
#endif
@@ -220,7 +225,7 @@ void check_indexed_view()
VERIFY( is_same_seq_type( seqN(2,fix<5>(5),fix<-2>), seqN(2,fix<5>,fix<-2>()) ) );
VERIFY( is_same_seq_type( seq(2,fix<5>), seqN(2,4) ) );
#if EIGEN_HAS_CXX11
#if EIGEN_HAS_CXX11
VERIFY( is_same_seq_type( seq(fix<2>,fix<5>), seqN(fix<2>,fix<4>) ) );
VERIFY( is_same_seq( seqN(2,std::integral_constant<int,5>(),std::integral_constant<int,-2>()), seqN(2,fix<5>,fix<-2>()) ) );
VERIFY( is_same_seq( seq(std::integral_constant<int,1>(),std::integral_constant<int,5>(),std::integral_constant<int,2>()),