function::user_ulong_warn - Linux

Overview

function::user_ulong_warn is a constructor that builds a warning handler function that converts an unsigned 64-bit integer to a warning

Syntax

namespace function {

bool user_ulong_warn(warning warner, int line, string const& spec, unsigned long long val);

}

The following parameters are accepted:

warner: A suitable predicate function that is ‘true’ when a warning should be issued
line: Line number of the code where the function is called.
spec: Format specification string for the val argument (see printf(3)).
val: Variable to be dumped in accordance with the format specification spec

Options/Flags

None.

Examples

The following code sample shows you how to use the function::user_ulong_warn function:

void f() {
  auto const& warner = function::user_julong_warn;
  warner(false, __LINE__, "%lld", 42ull);  // no warning
  warner(true, __LINE__, "%lld", 42ull);   // warning: 42
}

Common Issues