odb - Online in the Cloud

PROGRAM:

NAME

odb - object-relational mapping (ORM) compiler for C++

SYNOPSIS

odb [ options ] file [ file... ]

DESCRIPTION

Given a set of C++ classes in a header file, odb generates C++ code that allows you to
persist, query, and update objects of these classes in a relational database (RDBMS). The
relational database that the generated code should target is specified with the required
--database option (see below).

For an input file in the form name.hxx (other file extensions can be used instead of
.hxx), in the single-database mode (the default), the generated C++ files by default have
the following names: name-odb.hxx (header file), name-odb.ixx (inline file), and name-
odb.cxx (source file). Additionally, if the --generate-schema option is specified and the
sql schema format is requested (see --schema-format), the name.sql database schema file is
generated. If the separate schema format is requested, the database creation code is
generated into the separate name-schema.cxx file.

In the multi-database mode (see the --multi-database option below), the generated files
corresponding to the common database have the same names as in the single-database mode.
For other databases, the file names include the database name: name-odb-db.hxx, name-odb-
db.ixx, name-odb-db.cxx, name-db.sql, and name-schema-db.cxx (where db is the database
name).

OPTIONS

--help Print usage information and exit.

--version
Print version and exit.

-I dir Add dir to the beginning of the list of directories to be searched for included
header files.

-D name[=def]
Define macro name with definition def. If definition is omitted, define name to be
1.

-U name
Cancel any previous definitions of macro name, either built-in or provided with the
-D option.

--database|-d db
Generate code for the db database. Valid values are mssql, mysql, oracle, pgsql,
sqlite, and common (multi-database mode only).

--multi-database|-m type
Enable multi-database support and specify its type. Valid values for this option
are static and dynamic.

In the multi-database mode, options that determine the kind (for example, --schema-
format), names (for example, --odb-file-suffix), or content (for example, prologue
and epilogue options) of the output files can be prefixed with the database name
followed by a colon, for example, mysql:value. This restricts the value of such an
option to only apply to generated files corresponding to this database.

--default-database db
When static multi-database support is used, specify the database that should be
made the default. When dynamic multi-database support is used, common is always
made the default database.

--generate-query|-q
Generate query support code. Without this support you cannot use views and can only
load objects via their ids.

--generate-prepared
Generate prepared query execution support code.

--omit-unprepared
Omit un-prepared (once-off) query execution support code.

--generate-session|-e
Generate session support code. With this option session support will be enabled by
default for all the persistent classes except those for which it was explicitly
disabled using the db session pragma.

--generate-schema|-s
Generate the database schema. The database schema contains SQL statements that
create database tables necessary to store persistent classes defined in the file
being compiled. Note that by applying this schema, all the existing information
stored in such tables will be lost.

Depending on the database being used (--database option), the schema is generated
either as a standalone SQL file or embedded into the generated C++ code. By default
the SQL file is generated for the MySQL, PostgreSQL, Oracle, and Microsoft SQL
Server databases and the schema is embedded into the C++ code for the SQLite
database. Use the --schema-format option to alter the default schema format.

If database schema evolution support is enabled (that is, the object model version
is specified), then this option also triggers the generation of database schema
migration statements, again either as standalong SQL files or embedded into the
generated C++ code. You can suppress the generation of schema migration statements
by specifying the --suppress-migration option.

--generate-schema-only
Generate only the database schema. Note that this option is only valid when
generating schema as a standalone SQL file (see --schema-format for details).

--suppress-migration
Suppress the generation of database schema migration statements.

--suppress-schema-version
Suppress the generation of schema version table. If you specify this option then
you are also expected to manually specify the database schema version and migration
state at runtime using the odb::database::schema_version() function.

--schema-version-table name
Specify the alternative schema version table name instead of the default
schema_version. If you specify this option then you are also expected to manually
specify the schema version table name at runtime using the
odb::database::schema_version_table() function. The table name can be qualified.

--schema-format format
Generate the database schema in the specified format. Pass sql as format to
generate the database schema as a standalone SQL file or pass embedded to embed the
schema into the generated C++ code. The separate value is similar to embedded
except the schema creation code is generated into a separate C++ file (name-
schema.cxx by default). This value is primarily useful if you want to place the
schema creation functionality into a separate program or library. Repeat this
option to generate the same database schema in multiple formats.

--omit-drop
Omit DROP statements from the generated database schema.

--omit-create
Omit CREATE statements from the generated database schema.

--schema-name name
Use name as the database schema name. Schema names are primarily used to
distinguish between multiple embedded schemas in the schema catalog. They are not
to be confused with database schemas (database namespaces) which are specified with
the --schema option. If this option is not specified, the empty name, which is the
default schema name, is used.

--fkeys-deferrable-mode m
Use constraint checking mode m in foreign keys generated for object relationships.
Valid values for this option are not_deferrable, immediate, and deferred (default).
MySQL and SQL Server do not support deferrable foreign keys and for these databases
such keys are generated commented out. Other foreign keys generated by the ODB
compiler (such as the ones used to support containers and polymorphic hierarchies)
are always generated as not deferrable.

Note also that if you use either not_deferrable or immediate mode, then the order
in which you persist, update, and erase objects within a transaction becomes
important.

--default-pointer ptr
Use ptr as the default pointer for persistent objects and views. Objects and views
that do not have a pointer assigned with the db pointer pragma will use this
pointer by default. The value of this option can be * which denotes the raw pointer
and is the default, or qualified name of a smart pointer class template, for
example, std::auto_ptr. In the latter case, the ODB compiler constructs the object
or view pointer by adding a single template argument of the object or view type to
the qualified name, for example std::auto_ptr<object>. The ODB runtime uses object
and view pointers to return, and, in case of objects, pass and cache dynamically
allocated instances of object and view types.

Except for the raw pointer and the standard smart pointers defined in the <memory>
header file, you are expected to include the definition of the default pointer at
the beginning of the generated header file. There are two common ways to achieve
this: you can either include the necessary header in the file being compiled or you
can use the --hxx-prologue option to add the necessary #include directive to the
generated code.

--session-type type
Use type as the alternative session type instead of the default odb::session. This
option can be used to specify a custom session implementation to be use by the
persistent classes. Note that you will also need to include the definition of the
custom session type into the generated header file. This is normally achieved with
the --hxx-prologue* options.

--profile|-p name
Specify a profile that should be used during compilation. A profile is an options
file. The ODB compiler first looks for a database-specific version with the name
constructed by appending the -database.options suffix to name, where database is
the database name as specified with the --database option. If this file is not
found, then the ODB compiler looks for a database-independant version with the name
constructed by appending just the .options suffix.

The profile options files are searched for in the same set of directories as C++
headers included with the #include <...> directive (built-in paths plus those
specified with the -I options). The options file is first searched for in the
directory itself and then in its odb/ subdirectory.

For the format of the options file refer to the --options-file option below. You
can repeat this option to specify more than one profile.

--at-once
Generate code for all the input files as well as for all the files that they
include at once. The result is a single set of source/schema files that contain all
the generated code. If more than one input file is specified together with this
option, then the --input-name option must also be specified in order to provide the
base name for the output files. In this case, the directory part of such a base
name is used as the location of the combined file. This can be important for the
#include directive resolution.

--schema schema
Specify a database schema (database namespace) that should be assigned to the
persistent classes in the file being compiled. Database schemas are not to be
confused with database schema names (schema catalog names) which are specified with
the --schema-name option.

--export-symbol symbol
Insert symbol in places where DLL export/import control statements
(__declspec(dllexport/dllimport)) are necessary. See also the --extern-symbol
option below.

--extern-symbol symbol
If symbol is defined, insert it in places where a template instantiation must be
declared extern. This option is normally used together with --export-symbol when
both multi-database support and queries are enabled.

--std version
Specify the C++ standard that should be used during compilation. Valid values are
c++98 (default), c++11, and c++14.

--warn-hard-add
Warn about hard-added data members.

--warn-hard-delete
Warn about hard-deleted data members and persistent classes.

--warn-hard
Warn about both hard-added and hard-deleted data members and persistent classes.

--output-dir|-o dir
Write the generated files to dir instead of the current directory.

--input-name name
Use name instead of the input file to derive the names of the generated files. If
the --at-once option is specified, then the directory part of name is used as the
location of the combined file. Refer to the --at-once option for details.

--changelog file
Read/write changelog from/to file instead of the default changelog file. The
default changelog file name is derived from the input file name and it is placed
into the same directory as the input file. Note that the --output-dir option does
not affect the changelog file location. In other words, by default, the changelog
file is treated as another input rather than output even though the ODB compiler
may modify it. Use the --changelog-in and --changelog-out options to specify
different input and output chaneglog files.

--changelog-in file
Read changelog from file instead of the default changelog file. If this option is
specified, then you must also specify the output chanegelog file with --changelog-
out.

--changelog-out file
Write changelog to file instead of the default changelog file. If this option is
specified, then you must also specify the input chanegelog file with --changelog-
in.

--changelog-dir dir
Use dir instead of the input file directory as the changelog file directory. This
directory is also added to changelog files specified with the --changelog,
--changelog-in, and --changelog-in options unless they are absolute paths.

--init-changelog
Force re-initialization of the changelog even if one exists (all the existing
change history will be lost). This option is primarily useful for automated
testing.

--odb-file-suffix suffix
Use suffix to construct the names of the generated C++ files. In the single-
database mode the default value for this option is -odb. In the multi-database mode
it is -odb for the files corresponding to the common database and -odb-db (where db
is the database name) for other databases.

--sql-file-suffix suffix
Use suffix to construct the name of the generated schema SQL file. In the single-
database mode by default no suffix is used. In the multi-database mode the default
value for this option is -db (where db is the database name).

--schema-file-suffix suffix
Use suffix to construct the name of the generated schema C++ source file. In the
single-database mode the default value for this option is -schema. In the multi-
database mode it is -schema-db (where db is the database name). See the --schema-
format option for details.

--changelog-file-suffix sfx
Use sfx to construct the name of the changelog file. In the single-database mode by
default no suffix is used. In the multi-database mode the default value for this
option is -db (where db is the database name).

--hxx-suffix suffix
Use suffix instead of the default .hxx to construct the name of the generated C++
header file.

--ixx-suffix suffix
Use suffix instead of the default .ixx to construct the name of the generated C++
inline file.

--cxx-suffix suffix
Use suffix instead of the default .cxx to construct the name of the generated C++
source file.

--sql-suffix suffix
Use suffix instead of the default .sql to construct the name of the generated
database schema file.

--changelog-suffix suffix
Use suffix instead of the default .xml to construct the name of the changelog file.

--hxx-prologue text
Insert text at the beginning of the generated C++ header file.

--ixx-prologue text
Insert text at the beginning of the generated C++ inline file.

--cxx-prologue text
Insert text at the beginning of the generated C++ source file.

--schema-prologue text
Insert text at the beginning of the generated schema C++ source file.

--sql-prologue text
Insert text at the beginning of the generated database schema file.

--migration-prologue text
Insert text at the beginning of the generated database migration file.

--sql-interlude text
Insert text after all the DROP and before any CREATE statements in the generated
database schema file.

--hxx-epilogue text
Insert text at the end of the generated C++ header file.

--ixx-epilogue text
Insert text at the end of the generated C++ inline file.

--cxx-epilogue text
Insert text at the end of the generated C++ source file.

--schema-epilogue text
Insert text at the end of the generated schema C++ source file.

--sql-epilogue text
Insert text at the end of the generated database schema file.

--migration-epilogue text
Insert text at the end of the generated database migration file.

--hxx-prologue-file file
Insert the content of file at the beginning of the generated C++ header file.

--ixx-prologue-file file
Insert the content of file at the beginning of the generated C++ inline file.

--cxx-prologue-file file
Insert the content of file at the beginning of the generated C++ source file.

--schema-prologue-file file
Insert the content of file at the beginning of the generated schema C++ source
file.

--sql-prologue-file file
Insert the content of file at the beginning of the generated database schema file.

--migration-prologue-file f
Insert the content of file f at the beginning of the generated database migration
file.

--sql-interlude-file file
Insert the content of file after all the DROP and before any CREATE statements in
the generated database schema file.

--hxx-epilogue-file file
Insert the content of file at the end of the generated C++ header file.

--ixx-epilogue-file file
Insert the content of file at the end of the generated C++ inline file.

--cxx-epilogue-file file
Insert the content of file at the end of the generated C++ source file.

--schema-epilogue-file file
Insert the content of file at the end of the generated schema C++ source file.

--sql-epilogue-file file
Insert the content of file at the end of the generated database schema file.

--migration-epilogue-file f
Insert the content of file f at the end of the generated database migration file.

--odb-prologue text
Compile text before the input header file. This option allows you to add additional
declarations, such as custom traits specializations, to the ODB compilation
process.

--odb-prologue-file file
Compile file contents before the input header file. Prologue files are compiled
after all the prologue text fragments (--odb-prologue option).

--odb-epilogue text
Compile text after the input header file. This option allows you to add additional
declarations, such as custom traits specializations, to the ODB compilation
process.

--odb-epilogue-file file
Compile file contents after the input header file. Epilogue files are compiled
after all the epilogue text fragments (--odb-epilogue option).

--table-prefix prefix
Add prefix to table names and, for databases that have global index and/or foreign
key names, to those names as well. The prefix is added to both names that were
specified with the db table and db index pragmas and those that were automatically
derived from class and data member names. If you require a separator, such as an
underscore, between the prefix and the name, then you should include it into the
prefix value.

--index-suffix suffix
Use suffix instead of the default _i to construct index names. The suffix is only
added to names that were automatically derived from data member names. If you
require a separator, such as an underscore, between the name and the suffix, then
you should include it into the suffix value.

--fkey-suffix suffix
Use suffix instead of the default _fk to construct foreign key names. If you
require a separator, such as an underscore, between the name and the suffix, then
you should include it into the suffix value.

--sequence-suffix suffix
Use suffix instead of the default _seq to construct sequence names. If you require
a separator, such as an underscore, between the name and the suffix, then you
should include it into the suffix value.

--sql-name-case case
Convert all automatically-derived SQL names to upper or lower case. Valid values
for this option are upper and lower.

--table-regex regex
Add regex to the list of regular expressions that is used to transform
automatically-derived table names. See the SQL NAME TRANSFORMATIONS section below
for details.

--column-regex regex
Add regex to the list of regular expressions that is used to transform
automatically-derived column names. See the SQL NAME TRANSFORMATIONS section below
for details.

--index-regex regex
Add regex to the list of regular expressions that is used to transform
automatically-derived index names. See the SQL NAME TRANSFORMATIONS section below
for details.

--fkey-regex regex
Add regex to the list of regular expressions that is used to transform
automatically-derived foreign key names. See the SQL NAME TRANSFORMATIONS section
below for details.

--sequence-regex regex
Add regex to the list of regular expressions that is used to transform
automatically-derived sequence names. See the SQL NAME TRANSFORMATIONS section
below for details.

--statement-regex regex
Add regex to the list of regular expressions that is used to transform
automatically-derived prepared statement names. See the SQL NAME TRANSFORMATIONS
section below for details.

--sql-name-regex regex
Add regex to the list of regular expressions that is used to transform all
automatically-derived SQL names. See the SQL NAME TRANSFORMATIONS section below for
details.

--sql-name-regex-trace
Trace the process of applying regular expressions specified with the SQL name
--*-regex options. Use this option to find out why your regular expressions don't
do what you expected them to do.

--accessor-regex regex
Add regex to the list of regular expressions used to transform data member names to
function names when searching for a suitable accessor function. The argument to
this option is a Perl-like regular expression in the form /pattern/replacement/.
Any character can be used as a delimiter instead of / and the delimiter can be
escaped inside pattern and replacement with a backslash (\). You can specify
multiple regular expressions by repeating this option.

All the regular expressions are tried in the order specified and the first
expression that produces a suitable accessor function is used. Each expression is
tried twice: first with the actual member name and then with the member's public
name which is obtained by removing the common member name decorations, such as
leading and trailing underscores, the m_ prefix, etc. The ODB compiler also
includes a number of built-in expressions for commonly used accessor names, such as
get_foo, getFoo, getfoo, and just foo. The built-in expressions are tried last.

As an example, the following expression transforms data members with public names
in the form foo to accessor names in the form GetFoo:

/(.+)/Get\u$1/

See also the REGEX AND SHELL QUOTING section below.

--accessor-regex-trace
Trace the process of applying regular expressions specified with the --accessor-
regex option. Use this option to find out why your regular expressions don't do
what you expected them to do.

--modifier-regex regex
Add regex to the list of regular expressions used to transform data member names to
function names when searching for a suitable modifier function. The argument to
this option is a Perl-like regular expression in the form /pattern/replacement/.
Any character can be used as a delimiter instead of / and the delimiter can be
escaped inside pattern and replacement with a backslash (\). You can specify
multiple regular expressions by repeating this option.

All the regular expressions are tried in the order specified and the first
expression that produces a suitable modifier function is used. Each expression is
tried twice: first with the actual member name and then with the member's public
name which is obtained by removing the common member name decorations, such as
leading and trailing underscores, the m_ prefix, etc. The ODB compiler also
includes a number of built-in expressions for commonly used modifier names, such as
set_foo, setFoo, setfoo, and just foo. The built-in expressions are tried last.

As an example, the following expression transforms data members with public names
in the form foo to modifier names in the form SetFoo:

/(.+)/Set\u$1/

See also the REGEX AND SHELL QUOTING section below.

--modifier-regex-trace
Trace the process of applying regular expressions specified with the --modifier-
regex option. Use this option to find out why your regular expressions don't do
what you expected them to do.

--include-with-brackets
Use angle brackets (<>) instead of quotes ("") in the generated #include
directives.

--include-prefix prefix
Add prefix to the generated #include directive paths.

--include-regex regex
Add regex to the list of regular expressions used to transform generated #include
directive paths. The argument to this option is a Perl-like regular expression in
the form /pattern/replacement/. Any character can be used as a delimiter instead of
/ and the delimiter can be escaped inside pattern and replacement with a backslash
(\). You can specify multiple regular expressions by repeating this option. All the
regular expressions are tried in the order specified and the first expression that
matches is used.

As an example, the following expression transforms include paths in the form
foo/bar-odb.h to paths in the form foo/generated/bar-odb.h:

%foo/(.+)-odb.h%foo/generated/$1-odb.h%

See also the REGEX AND SHELL QUOTING section below.

--include-regex-trace
Trace the process of applying regular expressions specified with the --include-
regex option. Use this option to find out why your regular expressions don't do
what you expected them to do.

--guard-prefix prefix
Add prefix to the generated header inclusion guards. The prefix is transformed to
upper case and characters that are illegal in a preprocessor macro name are
replaced with underscores.

--show-sloc
Print the number of generated physical source lines of code (SLOC).

--sloc-limit num
Check that the number of generated physical source lines of code (SLOC) does not
exceed num.

--options-file file
Read additional options from file with each option appearing on a separate line
optionally followed by space and an option value. Empty lines and lines starting
with # are ignored. Option values can be enclosed in double (") or single (')
quotes to preserve leading and trailing whitespaces as well as to specify empty
values. If the value itself contains trailing or leading quotes, enclose it with an
extra pair of quotes, for example '"x"'. Non-leading and non-trailing quotes are
interpreted as being part of the option value.

The semantics of providing options in a file is equivalent to providing the same
set of options in the same order on the command line at the point where the
--options-file option is specified except that the shell escaping and quoting is
not required. You can repeat this option to specify more than one options file.

-x option
Pass option to the underlying C++ compiler (g++). The option value that doesn't
start with - is considered the g++ executable name.

-v Print the commands executed to run the stages of compilation.

--trace
Trace the compilation process.

--mysql-engine engine
Use engine instead of the default InnoDB in the generated database schema file. For
more information on the storage engine options see the MySQL documentation. If you
would like to use the database-default engine, pass default as the value for this
option.

--sqlite-override-null
Make all columns in the generated database schema allow NULL values. This is
primarily useful in schema migration since SQLite does not support dropping of
columns. By making all columns NULL we can later "delete" them by setting their
values to NULL. Note that this option overrides even the not_null pragma.

--sqlite-lax-auto-id
Do not force monotonically increasing automatically-assigned object ids. In this
mode the generated database schema omits the AUTOINCREMENT keyword which results in
faster object persistence but may lead to automatically-assigned ids not being in a
strictly ascending order. Refer to the SQLite documentation for details.

--pgsql-server-version ver
Specify the minimum PostgreSQL server version with which the generated C++ code and
schema will be used. This information is used to enable version-specific
optimizations and workarounds in the generated C++ code and schema. The version
must be in the major.minor form, for example, 9.1. If this option is not specified,
then 7.4 or later is assumed.

--oracle-client-version ver
Specify the minimum Oracle client library (OCI) version with which the generated
C++ code will be linked. This information is used to enable version-specific
optimizations and workarounds in the generated C++ code. The version must be in
the major.minor form, for example, 11.2. If this option is not specified, then 10.1
or later is assumed.

--oracle-warn-truncation
Warn about SQL names that are longer than 30 characters and are therefore
truncated. Note that during database schema generation (--generate-schema) ODB
detects when such truncations lead to name conflicts and issues diagnostics even
without this option specified.

--mssql-server-version ver
Specify the minimum SQL Server server version with which the generated C++ code and
schema will be used. This information is used to enable version-specific
optimizations and workarounds in the generated C++ code and schema. The version
must be in the major.minor form, for example, 9.0 (SQL Server 2005), 10.5 (2008R2),
or 11.0 (2012). If this option is not specified, then 10.0 (SQL Server 2008) or
later is assumed.

--mssql-short-limit size
Specify the short data size limit. If a character, national character, or binary
data type has a maximum length (in bytes) less than or equal to this limit, then it
is treated as short data, otherwise it is long data. For short data ODB pre-
allocates an intermediate buffer of the maximum size and binds it directly to a
parameter or result column. This way the underlying API (ODBC) can read/write
directly from/to this buffer. In the case of long data, the data is read/written
in chunks using the SQLGetData()/SQLPutData() ODBC functions. While the long data
approach reduces the amount of memory used by the application, it may require
greater CPU resources. The default short data limit is 1024 bytes. When setting a
custom short data limit, make sure that it is sufficiently large so that no object
id in the application is treated as long data.

SQL NAME TRANSFORMATIONS

The ODB compiler provides a number of mechanisms for transforming automatically-derived
SQL names, such as tables, columns, etc., to match a specific naming convention. At the
higher level, we can add a prefix to global names (tables and, for some databases, indexes
and/or foreign keys) with the --table-prefix option. Similarly, we can specify custom
suffixes for automatically-derived index (--index-suffix; default is _i), foreign key
(--fkey-suffix; default is _fk), and sequence (--sequence-suffix; default is _seq) names.
Finally, we can also convert all the names to upper or lower case with the --sql-name-case
option (valid values are upper and lower).

At the lower level we can specify a set of regular expressions to implement arbitrary
transformations of the automatically-derived SQL names. If we want a particular regular
expression only to apply to a specific name, for example, table or column, then we use one
of the --kind-regex options, where kind can be table, column, index, fkey, sequence, or
statement. On the other hand, if we want our regular expressions to apply to all SQL
names, then we use the --sql-name-regex option.

The interaction between the higher and lower level transformations is as follows. Prefixes
and suffixes are added first. Then the regular expression transformations are applied.
Finally, if requested, the name is converted to upper or lower case. Note also that all of
these transformations except for --table-prefix only apply to automatically-derived names.
In other words, if a table, column, etc., name was explicitly specified with a pragma,
then it is used as is, without applying any (except for the table prefix) transformations.

The value for the --*-regex options is a Perl-like regular expression in the form
/pattern/replacement/. Any character can be used as a delimiter instead of / and the
delimiter can be escaped inside pattern and replacement with a backslash (\). You can
also specify multiple regular expressions by repeating these options.

All the regular expressions are tried in the order specified with the name-specific
expressions (for example, --table-regex) tried first followed by the generic expressions
(--sql-name-regex). The first expression that matches is used.

As an example, consider a regular expression that transforms a class name in the form CFoo
to a table name in the form FOO:

--table-regex '/C(.+)/\U$1/'

As a more interesting example, consider the transformation of class names that follow the
upper camel case convention (for example, FooBar) to table names that follow the
underscore-separated, all upper case convention (for example, FOO_BAR). For this case we
have to use separate expressions to handle one-word, two-word, etc., names:

--table-regex '/([A-z][a-z]+)/\U$1/'

--table-regex '/([A-z][a-z]+)([A-z][a-z]+)/\U$1_$2/'

See also the REGEX AND SHELL QUOTING section below.

REGEX AND SHELL QUOTING

When entering a regular expression argument in the shell command line it is often
necessary to use quoting (enclosing the argument in " " or ' ') in order to prevent the
shell from interpreting certain characters, for example, spaces as argument separators and
$ as variable expansions.

Unfortunately it is hard to achieve this in a manner that is portable across POSIX shells,
such as those found on GNU/Linux and UNIX, and Windows shell. For example, if you use " "
for quoting you will get a wrong result with POSIX shells if your expression contains $.
The standard way of dealing with this on POSIX systems is to use ' ' instead.
Unfortunately, Windows shell does not remove ' ' from arguments when they are passed to
applications. As a result you may have to use ' ' for POSIX and " " for Windows ($ is not
treated as a special character on Windows).

Alternatively, you can save regular expression options into a file, one option per line,
and use this file with the --options-file option. With this approach you don't need to
worry about shell quoting.

DIAGNOSTICS

If the input file is not valid C++, odb will issue diagnostic messages to STDERR and exit
with non-zero exit code.

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