QualityCentral

Public Report

Report From: Delphi-BCB/Compiler/C++/Front End/Language [ Add a report in this area ]

Report #: 10267

Status: Closed

The compiler obligatorily converts member arrays to pointers

Project: C++Builder

Build #: 6.0.10.161

Version: 10.0

Submitted By: Christopher Yeleighton

Report Type: Basic functionality failure

Date Reported: 1/11/2005 1:01:17 PM

Severity: Commonly encountered problem

Last Updated: 3/20/2012 2:24:39 AM

Platform: All versions

Internal Tracking #: 237290

Resolution: Fixed (Resolution Comments)

Resolved in Build: : 12.0.2978.11303

Duplicate of: None

Voting and Rating

Overall Rating: (2 Total Ratings)

4.00 out of 5

Total Votes: 11

Description

The identifiers in this piece correspond to errors they generate.  The message log is appended.  The constructs used in this code do not compile mainly because the compiler does not recognize a member array as an array but it converts a reference to the member to the corresponding pointer.  It does not happen with local arrays, global arrays and static arrays qualified by type name.

[C++ Warning] nocr.cpp(8): W8028 Temporary used to initialize 'E2034'
  Full parser context
    nocr.cpp(6): parsing: void testlocam()
[C++ Error] nocr.cpp(8): E2034 Cannot convert 'int *' to 'int[1]'
  Full parser context
    nocr.cpp(6): parsing: void testlocam()
[C++ Error] nocr.cpp(9): E2027 Must take address of a memory location
  Full parser context
    nocr.cpp(6): parsing: void testlocam()
[C++ Error] nocr.cpp(10): E2031 Cannot cast from 'int *' to 'int ( &)[1]'
  Full parser context
    nocr.cpp(6): parsing: void testlocam()
[C++ Error] nocr.cpp(11): E2285 Could not find a match for 'E2285<T,N>(int *)'
  Full parser context
    nocr.cpp(6): parsing: void testlocam()
[C++ Error] nocr.cpp(12): E2285 Could not find a match for 'E2285<T,N>(int *)'
  Full parser context
    nocr.cpp(6): parsing: void testlocam()
[C++ Warning] nocr.cpp(13): W8004 'E2031' is assigned a value that is never used
  Full parser context
    nocr.cpp(6): parsing: void testlocam()
[C++ Warning] nocr.cpp(13): W8004 'E2027' is assigned a value that is never used
  Full parser context
    nocr.cpp(6): parsing: void testlocam()
[C++ Warning] nocr.cpp(13): W8004 'E2034' is assigned a value that is never used
  Full parser context
    nocr.cpp(6): parsing: void testlocam()

Steps to Reproduce:

Try compiling the following piece of code:

struct testarrmem { static int x[01]; int y[01]; };

template<class T, unsigned N>
void E2285(T (&)[N]);

void testlocam(void) {
testarrmem z;
int (&E2034)[01] = z.x;
int (*E2027)[01] = &z.x;
int (&E2031)[01] = (int (&)[01]) z.y;
E2285(z.x);
E2285(z.y);
}

Workarounds

E2034, E2027: Replace z.x with testarrmem::x
E2031: remove the explicit cast
E2285: use f(T (*)[N]) instead of f(T (&)[N]), i.e. pass a pointer to an array instead of a reference

Attachment

None

Comments

None

Developer Tools

Database Tools

QualityCentral Delphi-BCB Compiler C++ Front End access Bitfields Destructors Diagnostics Exception Handling Extensions Initialization Inline Assembly Invocation Language Mangling Scheme Namespaces Object Generation Overloading Pragmas Pre-Compiled Headers Preprocessor Refactoring RTTI Templates

Developer Tools

Database Tools