c++ - How to use Gdb debugger to find value of ZZ object from Number Theory Library? -


i use gdb debugger print values of variable of type zz. data type defined in number theory library or ntl. when use "print x" find out variable's value obtain this:

print x  $1 = {rep=0xab2cc54}.

i guess address of zz object. how can print value ? should mention don't know internal representation of class.

can use ntl compiler eclipse debug easier application ?

… zz object. how can print value ?

this bit ugly, works:

(gdb) call ntl::operator<<(std::ostream&, ntl::zz const&)(cerr, x) 42$1 = (std::ostream &) @0x620020: <incomplete type>

(in example, variable x has value 42).
if don't want garbage after value, can cast void:

(gdb) call (void)ntl::operator<<(std::ostream&, ntl::zz const&)(cerr, x) 42(gdb)

(but note there's no newline after value).

if you're not using namespace std, may have write

(gdb) call ntl::operator<<(std::ostream&, ntl::zz const&)('std::cerr', x)

sometimes cerr may not in scope:

(gdb) call ntl::operator<<(std::ostream&, ntl::zz const&)(cerr, x)         no symbol "cerr" in current context.

- can try cout, gets uglier, because buffered output has flushed:

(gdb) call ntl::operator<<(std::ostream&, ntl::zz const&)(cout, x) (gdb) call 'std::basic_ostream<char, std::char_traits<char>>& std::operator<< <std::char_traits<char>>(std::basic_ostream<char, std::char_traits<char>>&, char const*)'(&cout, "\n") 42

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