localpointer.h File Reference

C++ API: "Smart pointers" for use with and in ICU4C C++ code. More...

#include "unicode/utypes.h"
#include <memory>

Go to the source code of this file.

Data Structures
class	icu::LocalPointerBase< T >
	"Smart pointer" base class; do not use directly: use LocalPointer etc. More...
class	icu::LocalPointer< T >
	"Smart pointer" class, deletes objects via the standard C++ delete operator. More...
class	icu::LocalArray< T >
	"Smart pointer" class, deletes objects via the C++ array delete[] operator. More...

Namespaces
namespace	icu
	File coll.h.

Macros
#define	U_DEFINE_LOCAL_OPEN_POINTER(LocalPointerClassName, Type, closeFunction)    using LocalPointerClassName = internal::LocalOpenPointer<Type, closeFunction>
	"Smart pointer" definition macro, deletes objects via the closeFunction.

Detailed Description

C++ API: "Smart pointers" for use with and in ICU4C C++ code.

These classes are inspired by

• std::auto_ptr
• boost::scoped_ptr & boost::scoped_array
• Taligent Safe Pointers (TOnlyPointerTo)

but none of those provide for all of the goals for ICU smart pointers:

• Smart pointer owns the object and releases it when it goes out of scope.
• No transfer of ownership via copy/assignment to reduce misuse. Simpler & more robust.
• ICU-compatible: No exceptions.
• Need to be able to orphan/release the pointer and its ownership.
• Need variants for normal C++ object pointers, C++ arrays, and ICU C service objects.

For details see https://icu.unicode.org/design/cpp/scoped_ptr

Definition in file localpointer.h.

Macro Definition Documentation

U_DEFINE_LOCAL_OPEN_POINTER

#define U_DEFINE_LOCAL_OPEN_POINTER	(		LocalPointerClassName,
			Type,
			closeFunction
	)		using LocalPointerClassName = internal::LocalOpenPointer<Type, closeFunction>

"Smart pointer" definition macro, deletes objects via the closeFunction.

Defines a subclass of LocalPointerBase which works just like LocalPointer<Type> except that this subclass will use the closeFunction rather than the C++ delete operator.

Usage example:

LocalUCaseMapPointer csm(ucasemap_open(localeID, options, &errorCode));
utf8OutLength=ucasemap_utf8ToLower(csm.getAlias(),
    utf8Out, (int32_t)sizeof(utf8Out),
    utf8In, utf8InLength, &errorCode);
if(U_FAILURE(errorCode)) { return; }  // no need to explicitly delete the UCaseMap

See also

LocalPointerBase

LocalPointer

Stable:

ICU 4.4

Definition at line 550 of file localpointer.h.