Libxercescdev Ubuntucleverjournal

• Using libc++ on Linux
• Libc++ Configuration Macros
• Libc++ Extensions
  • Extended applications of [[nodiscard]]

1. Libxerces-c-dev
2. Libxerces

The following libvirt-lxc packages are deprecated starting with Red Hat Enterprise Linux 7.1: libvirt-daemon-driver-lxc. How to Install libjasper-dev software package in Ubuntu 17.04 (Zesty Zapus) libjasper-dev software package provides Development files for the JasPer JPEG-2000 library, you can install in your Ubuntu 17.04 (Zesty Zapus) by running the commands given below on the terminal. Dep: libcurl3 (= 7.47.0-1ubuntu2) not amd64, i386 easy-to-use client-side URL transfer library (OpenSSL flavour) dep: libcurl3 (= 7.47.0-1ubuntu2.18) amd64, i386 sug: libcurl3-dbg debugging symbols for libcurl (OpenSSL, GnuTLS and NSS flavours).

If you already have libc++ installed you can use it with clang.

On macOS and FreeBSD libc++ is the default standard libraryand the -stdlib=libc++ is not required. Free ecu flash software download.

If you want to select an alternate installation of libc++ youcan use the following options.

The option -Wl,-rpath,/lib adds a runtime librarysearch path. Meaning that the systems dynamic linker will look for libc++ in/lib whenever the program is run. Alternatively theenvironment variable LD_LIBRARY_PATH (DYLD_LIBRARY_PATH on macOS) canbe used to change the dynamic linkers search paths after a program is compiled.

An example of using LD_LIBRARY_PATH:

Prior to LLVM 9.0, libc++ provides the implementation of the filesystem libraryin a separate static library. Users of and are required to link -lc++fs. Prior to libc++ 7.0, users of were required to link libc++experimental.

Starting with LLVM 9.0, support for is provided in the mainlibrary and nothing special is required to use .

Libc++ provides implementations of experimental technical specificationsin a separate library, libc++experimental.a. Users of headers may be required to link -lc++experimental.

Libc++experimental.a may not always be available, even when libc++ is alreadyinstalled. For information on building libc++experimental from source seeBuilding Libc++ andlibc++experimental CMake Options.

Also see the Experimental Library Implementation Statuspage.

Warning

• The contents of the headers and libc++experimental.alibrary will not remain compatible between versions.
• No guarantees of API or ABI stability are provided.
• When we implement the standardized version of an experimental feature,the experimental feature is removed two releases after the non-experimentalversion has shipped. The full policy is explained here.

On Linux libc++ can typically be used with only ‘-stdlib=libc++'. Howeversome libc++ installations require the user manually link libc++abi themselves.If you are running into linker errors when using libc++ try adding ‘-lc++abi'to the link line. For example:

Alternately, you could just add libc++abi to your libraries list, which inmost situations will give the same result:

GCC does not provide a way to switch from libstdc++ to libc++. You must manuallyconfigure the compile and link commands.

In particular you must tell GCC to remove the libstdc++ include directoriesusing -nostdinc++ and to not link libstdc++.so using -nodefaultlibs.

Note that -nodefaultlibs removes all of the standard system libraries andnot just libstdc++ so they must be manually linked. For example:

GDB does not support pretty-printing of libc++ symbols by default. Unfortunatelylibc++ does not provide pretty-printers itself. However there are 3rdparty implementations available and although they are not officiallysupported by libc++ they may be useful to users.

Known 3rd Party Implementations Include:

• Koutheir's libc++ pretty-printers.

Libc++ provides a number of configuration macros which can be used to enableor disable extended libc++ behavior, including enabling 'debug mode' orthread safety annotations.

This macro is used to re-enable an extension in std::tuple which allowedit to be implicitly constructed from fewer initializers than containedelements. Elements without an initializer are default constructed. For example:

Since libc++ 4.0 this extension has been disabled by default. This macromay be defined to re-enable it in order to support existing code that dependson the extension. New use of this extension should be discouraged.See PR 27374 for more information.

Note: The 'reduced-arity-initialization' extension is still offered but onlyfor explicit conversions. Example:

This macro disables the additional diagnostics generated by libc++ using thediagnose_if attribute. These additional diagnostics include checks for:

• Giving set, map, multiset, multimap and their unordered_counterparts a comparator which is not const callable.
• Giving an unordered associative container a hasher that is not constcallable.

Microsoft's C and C++ headers are fairly entangled, and some of their C++headers are fairly hard to avoid. In particular, vcruntime_new.h gets pulledin from a lot of other headers and provides definitions which clash withlibc++ headers, such as nothrow_t (note that nothrow_t is a struct, sothere's no way for libc++ to provide a compatible definition, since you can'thave multiple definitions).

By default, libc++ solves this problem by deferring to Microsoft's vcruntimeheaders where needed. However, it may be undesirable to depend on vcruntimeheaders, since they may not always be available in cross-compilation setups,or they may clash with other headers. The _LIBCPP_NO_VCRUNTIME macroprevents libc++ from depending on vcruntime headers. Consequently, it alsoprevents libc++ headers from being interoperable with vcruntime headers (fromthe aforementioned clashes), so users of this macro are promising to notattempt to combine libc++ headers with the problematic vcruntime headers. Thismacro also currently prevents certain operator new/operator deletereplacement scenarios from working, e.g. replacing operator new andexpecting a non-replaced operator new[] to call the replaced operator new.

Libxerces-c-dev

Known 3rd Party Implementations Include:

• Koutheir's libc++ pretty-printers.

Libc++ provides a number of configuration macros which can be used to enableor disable extended libc++ behavior, including enabling 'debug mode' orthread safety annotations.

This macro is used to re-enable an extension in std::tuple which allowedit to be implicitly constructed from fewer initializers than containedelements. Elements without an initializer are default constructed. For example:

Since libc++ 4.0 this extension has been disabled by default. This macromay be defined to re-enable it in order to support existing code that dependson the extension. New use of this extension should be discouraged.See PR 27374 for more information.

Note: The 'reduced-arity-initialization' extension is still offered but onlyfor explicit conversions. Example:

This macro disables the additional diagnostics generated by libc++ using thediagnose_if attribute. These additional diagnostics include checks for:

• Giving set, map, multiset, multimap and their unordered_counterparts a comparator which is not const callable.
• Giving an unordered associative container a hasher that is not constcallable.

Microsoft's C and C++ headers are fairly entangled, and some of their C++headers are fairly hard to avoid. In particular, vcruntime_new.h gets pulledin from a lot of other headers and provides definitions which clash withlibc++ headers, such as nothrow_t (note that nothrow_t is a struct, sothere's no way for libc++ to provide a compatible definition, since you can'thave multiple definitions).

By default, libc++ solves this problem by deferring to Microsoft's vcruntimeheaders where needed. However, it may be undesirable to depend on vcruntimeheaders, since they may not always be available in cross-compilation setups,or they may clash with other headers. The _LIBCPP_NO_VCRUNTIME macroprevents libc++ from depending on vcruntime headers. Consequently, it alsoprevents libc++ headers from being interoperable with vcruntime headers (fromthe aforementioned clashes), so users of this macro are promising to notattempt to combine libc++ headers with the problematic vcruntime headers. Thismacro also currently prevents certain operator new/operator deletereplacement scenarios from working, e.g. replacing operator new andexpecting a non-replaced operator new[] to call the replaced operator new.

Libxerces-c-dev

This section documents various extensions provided by libc++, how they'reprovided, and any information regarding how to use them.

The [[nodiscard]] attribute is intended to help users find bugs wherefunction return values are ignored when they shouldn't be. After C++17 theC++ standard has started to declared such library functions as [[nodiscard]].However, this application is limited and applies only to dialects after C++17.Users who want help diagnosing misuses of STL functions may desire a moreliberal application of [[nodiscard]].

For this reason libc++ provides an extension that does just that! Theextension must be enabled by defining _LIBCPP_ENABLE_NODISCARD. The extendedapplications of [[nodiscard]] takes two forms:

1. Backporting [[nodiscard]] to entities declared as such by thestandard in newer dialects, but not in the present one.
2. Extended applications of [[nodiscard]], at the libraries discretion,applied to entities never declared as such by the standard.

Users may also opt-out of additional applications [[nodiscard]] usingadditional macros.

Applications of the first form, which backport [[nodiscard]] from a newerdialect may be disabled using macros specific to the dialect it was added. Forexample _LIBCPP_DISABLE_NODISCARD_AFTER_CXX17.

Libxerces

Applications of the second form, which are pure extensions, may be disabledby defining _LIBCPP_DISABLE_NODISCARD_EXT.

This section lists all extended applications of [[nodiscard]] to entitieswhich no dialect declares as such (See the second form described above).

• adjacent_find
• all_of
• any_of
• binary_search
• clamp
• count_if
• count
• equal_range
• equal
• find_end
• find_first_of
• find_if_not
• find_if
• find
• get_temporary_buffer
• includes
• is_heap_until
• is_heap
• is_partitioned
• is_permutation
• is_sorted_until
• is_sorted
• lexicographical_compare
• lower_bound
• max_element
• max
• min_element
• min
• minmax_element
• minmax
• mismatch
• none_of
• remove_if
• remove
• search_n
• search
• unique
• upper_bound
• lock_guard's constructors