Revision 6542fdbd8d000fc5b18eb3f396b5d18f1ffd6521 authored by Paul Russo on 13 June 2008, 20:34:11 UTC, committed by Paul Russo on 13 June 2008, 20:34:11 UTC
"int" so that NULL translates to a constant integral type. The C++ standard has this to say in section 4.10 Pointer conversions [conv.ptr]: A "null pointer constant" is an integral constant expression (5.19) rvalue of integer type that evaluates to zero. This is a problem in a function overloading situation like this: void f(double); void f(char*); int main() { for (int i = 1; i < 10; ++i) { f(i); } } The rule in section 4.10 on null pointer constants and the rules in Chapter 13 Overloading, make f(char*) a non-viable function for overloading purposes because i is not a "integral constant expression". However given: #define POGO 0 then in the same loop a call written: f(POGO); is ambiguous since both of the functions are viable (because POGO is substituted with 0, which is an integral constant expression). In cint "#define int MyType" is implemented as a variable definition using the special type macroInt$. So we need to make that type const so that overloading works correctly. Note that this is all a gross hack to paper over the fact that cint does not have a proper preprocessor. -- Paul Russo and Philippe Canal git-svn-id: http://root.cern.ch/svn/root/trunk@24273 27541ba8-7e3a-0410-8455-c3a389f83636
1 parent 81bd3c4
File | Mode | Size |
---|---|---|
HELP.html | -rwxr-xr-x | 12.5 KB |
ROOT.css | -rwxr-xr-x | 10.3 KB |
ROOT.js | -rwxr-xr-x | 5.8 KB |
footer.html | -rwxr-xr-x | 501 bytes |
header.html | -rwxr-xr-x | 1.1 KB |
shadow.gif | -rwxr-xr-x | 3.5 KB |
shadowAlpha.png | -rwxr-xr-x | 3.3 KB |
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...