Question

i am using a boost::array which has the format
< char, const std::size_t >

void test(const std::size_t XXX)
{
    boost::shared_ptr<boost::array<unsigned char, XXX>> buf(new boost::array<unsigned char, max_size>);
    .
    .
    .
};
test(100);
test(20);

This is leading

to the Error:

error C2971: ‘boost::array’ : template parameter ‘N’ : ‘size’ : a local variable cannot be used as a non-type argument

Can you give me a hint how to pass boost::array the second parameter?

thanks

Answer 1

Templates are instantiated during the compilation, so that their parameters have to be known before the program runs.

That means you cannot use a variable as a template parameter. Such a parameters must be constant expressions (constant variables is not enough), addresses of functions or objects with external linkage, or addresses of static class members.