Re: [Opencxx-users] template keyword cause parse error

[J D. <ja...@ja...>]

has anyone thought about integrating boosts spirit/wave with openc++
wave is a fully ansi compliant preprocessor as far as i understand
Ive been thinking about adding metaobjects to a modified wave 
preprocessor, openc++ just doesnt have a powerfull enough parser


Stefan Seefeld wrote:

> Alexander Vodomerov wrote:
>
>> Recently, I've found that OpenC++ (2.8) can not parse following code:
>>
>> class X
>> {
>> public:
>>   template <typename T> int g() { return 123; }
>> };
>>
>> template <typename T> class A
>> {
>> public:
>>   X x;
>>   X& getx() { return x; }
>>   void f() { getx().g<T>(); }
>> };
>>
>> int main()
>> {
>>   A<int> a;
>>   a.f();
>> }
>>
>> It says:
>> [alex@lorien ~]$ ./occ -c 1.cpp
>> 1.cpp: In member function `void A<T>::f()':
>> 1.cpp:12: error: parse error before `;' token
>>
>> The 12th line corresponds to getx().g<T>()
>>
>> Is this a correct code? I have 4 compilers on my machine (gcc 3.3.5,
>> gcc 3.4.3, gcc 4.0.0 snapshot, Intel C/C++ 8.1). All of them
>> compile this code cleanly.
>
>
> The OpenC++ parser is indeed not powerful enough to understand that line.
> The reason is that to be able to decide whether '<' is a relational 
> operator
> or the start of a template parameter spec, it has to figure out what 'g'
> is. That requires symbol lookup, which OpenC++ doesn't do during parsing.
>
> Regards,
>         Stefan
>
>
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