Header for using int_ in template class

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I get the C2061 syntax error: identifier 'int_' on using it.
is there a header or can I write some struct to handle that?
what is difference of int x and int_<x>?

What I have tried:

I use int x but I some error appeared that meant don't use that in template class

Posted 22-Jan-18 21:22pm

saide_a

Updated 23-Jan-18 0:47am

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3 solutions

Solution 1

You should know, that is: why do you need it? What library are you using? For instance, if you are using boost MPL than the relevant header is boost/mpl/int.hpp, as stated by the documentation: The MPL Reference Manual: int_ - 1.47.0[^].

Posted 22-Jan-18 21:50pm

CPallini

Updated 22-Jan-18 21:51pm

v2

Comments

saide_a 23-Jan-18 3:54am

I want it without using boost

Solution 2

You cannot use it with int, as it is a built in type, not a template. What exactly are you trying to achieve?

Posted 22-Jan-18 22:06pm

Richard MacCutchan

v2

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saide_a 23-Jan-18 4:33am

I found a source which in for serialization with c++11 when I compile it produce this error.
part of code that get error:
template <class tuple_type, size_t pos>
inline size_t get_tuple_size(const tuple_type& obj, int_<pos>)
{
constexpr size_t idx = std::tuple_size<tuple_type>::value - pos - 1;
size_t acc = get_size(std::get<idx>(obj));
return acc + get_tuple_size(obj, int_<pos - 1>());
}

Richard MacCutchan 23-Jan-18 5:02am

What error?

saide_a 23-Jan-18 5:19am

the C2061 syntax error: identifier 'int_'

Richard MacCutchan 23-Jan-18 5:32am

There is no such type in C++.

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Jochen Arndt · Accepted Answer · 2018-01-23T00:47:00

It looks like you used the code from github.com/motonacciu/meta-serialization/blob/master/include/serialize.h[^].

If you have a look on top of that file, you will find

C++

namespace detail {

	template<std::size_t> struct int_{};

} // end detail namespace

That is a template similar to those used by Boost (see the link from solution 1) to implement an Integral Constant (see The MPL Reference Manual: Integral Constant - 1.47.0[^]).

If you are using the unmodified file it should compile with recent compilers (I can't test it with VS 2015 and 2017 because I have actually no access to those).