GCC 4.8.0 - 7.0 has a bug (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56480) involving specialization in a namespace enclosing the specialized template. This PR fixes an appearance of this bug in the span header.
Both checks for Expects(ExtentType::size() != dynamic_extent); in storage_type are always useless. storage_type<ExtentType> is only ever created with ExtentType == extent_type<Extent>, where Extent has type std::size_t and is the extent of the span.
Looking at extent_type<std::size_t Ext>::size():
- if Ext != dynamic_extent, then size() always returns Ext, and therefore size() != dynamic_extent
- if Ext == dynamic_extent, then size() returns extent_type<dynamic_extent>::size_. size_ can only be set via one of two constructors:
- constexpr explicit extent_type(size_type size), which already does the check in question
- constexpr explicit extent_type(extent_type<Other> ext) : size_(ext.size()), which simply relies on the other extent's size() method
So there is no way for ExtentType::size() == dynamic_extent.
This file uses std::exception, so it should include the appropriate header.
Normally it gets the STL's <exception> header included via the gsl/assert file, but this is skipped with _HAS_EXCEPTIONS=0. I understand _HAS_EXCEPTIONS is undocumented and unsupported, but regardless, the appropriate header should be included here.
Alternatively, gsl/narrow should be modified to support _HAS_EXCEPTIONS=0, like gsl/assert was. But I'm not proposing that change. <exception> does define std::exception even with _HAS_EXCEPTIONS=0.
In the implementation of gsl::narrow, there is a comparison `static_cast<U>(t) != u` which may be comparing two floats.
The comparison here is done purposefully to categorize ill effects of narrowing conversion, since the values being compared *should* be the same when compared with `operator==`.
Note, using #pragma GCC will suppress this warning for both GCC and Clang.
[SF.12: Prefer the quoted form of #include for files relative to the including file and the angle bracket form everywhere else](https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#Rs-incform)
Additionally changed #include order in `span` so that all `span_ext` is in the GSL include block and not in the STL include block.
Fixes issues #1025.
Co-authored-by: Werner Henze <w.henze@avm.de>
* move span specialization of 'at' to <gsl/span> and update the parameter to be taken by reference
* undid previous changes and acted upon decisions made in maintainer sync. Fixed tests failing in /kernel mode
* ran clang-format on the include folder
* ran clang-format on the test folder
Co-authored-by: Jordan Maples <jordan.maples@microsoft.com>
* is_comparable_to_nullptr for better static_assert
Trying `gsl::not_null<char> p2{ 0 };` on VS2019 the current implementation would trigger
>error C2446 : '!=' : no conversion from 'nullptr' to 'int'
>message: A native nullptr can only be converted to bool or , using reinterpret_cast, to an integral type
>message: see reference to class template instantiation 'gsl::not_null<char>' being compiled
>error C2955 : 'std::is_convertible' : use of class template requires template argument list
>message: see declaration of 'std::is_convertible'
>error C2039 : 'value' : is not a member of 'std::is_convertible<_From,_To>'
>error C2065 : 'value' : undeclared identifier
The new implementation gives much shorter and clearer message and does exactly as the `static_assert` intends to do:
> error C2338: T cannot be compared to nullptr.
> message : see reference to class template instantiation 'gsl::not_null<char *>' being compiled
* Update include/gsl/pointers
Co-authored-by: Casey Carter <cartec69@gmail.com>
Co-authored-by: Werner Henze <w.henze@avm.de>
Co-authored-by: Casey Carter <cartec69@gmail.com>
It's much nicer and less error prone to just use add_subdirectory to establish the include directory.
Hide the GNUInstallDirs module by placing it in the helper module. The intent being that the main CMakeLists.txt should have a little code as possible. So that readers can quickly understand the project.
Use include_guard() when available in cmake 3.10+
Co-authored-by: Juan Ramos <juanr0911@gmail.com>
* Azure pipeline (#8)
* azure-pipeline test
* nl @ eof
* trimming the pipeline and adding debug steps
* removing redundant lines
* change ctest to script cmd and remove debug
* removed bad char
* added dir change for ctest
* explicit output file and cmake standard
* test cat
* more ctest tests
* injecting failure in test for validation
* another test
* removing bad test
* massive matrix
* added parallel
* commenting everything but xcode out for testing purposes
* uncomment the other tests
* testing some variables
* rename
* changed macos versions
* adding one more layer of templates
* fixing jobs.yml
* idk what i'm doing
* slight modifications
* maybe some spaces will help
* removing 'variables.'
* another test
* adding back pr w/ autocancel
* adding failing test to validate error = failing task
* remove failing test
* trigger master
* nl in steps.yml
* removing deprecation of basic_zstring and derived types. only *string_span should have been deprecated
* Azure pipeline (#8)
* azure-pipeline test
* nl @ eof
* trimming the pipeline and adding debug steps
* removing redundant lines
* change ctest to script cmd and remove debug
* removed bad char
* added dir change for ctest
* explicit output file and cmake standard
* test cat
* more ctest tests
* injecting failure in test for validation
* another test
* removing bad test
* massive matrix
* added parallel
* commenting everything but xcode out for testing purposes
* uncomment the other tests
* testing some variables
* rename
* changed macos versions
* adding one more layer of templates
* fixing jobs.yml
* idk what i'm doing
* slight modifications
* maybe some spaces will help
* removing 'variables.'
* another test
* adding back pr w/ autocancel
* adding failing test to validate error = failing task
* remove failing test
* trigger master
* nl in steps.yml
* remove forced decay of array reference to pointer in span array ctor
narrow() is now in gsl_narrow rather than gsl_util. Include gsl_narrow when exceptions are enabled. Ensures that #include <gsl/gsl> includes entire library as advertised in the documentation.
Co-authored-by: Bowie Owens <bowie.owens@csiro.au>
- `s[s.size() - 1]` is wrong for empty `s`, so `Expects(s.size() > 0)`
- no hard coded `'\0'`but `value_type{}`
- hard code `empty()` to return `false`
- simplify `as_string_span`: can never be `empty`
- clarify comment on `ensure_z`
