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unary_function removed in C++17. It can just be deleted.
--- a/src/gm_utils.h
+++ b/src/gm_utils.h
@@ -117,7 +117,7 @@
* Function object to print something into a stream (to be used with for_each)
*/
template<class T>
-struct print_f : public std::unary_function<T, void>
+struct print_f
{
print_f(std::ostream& out, const string &s = ", ") : os(out), sep(s) {}
void operator() (T x) { os << x << sep; }
@@ -129,7 +129,7 @@
* Function object to print a pair into two streams (to be used with for_each)
*/
template<class T>
-struct pair_print_f : public std::unary_function<T, void>
+struct pair_print_f
{
pair_print_f(std::ostream& out1, std::ostream& out2, const string &s = ", ") :
os1(out1), os2(out2), sep(s) {}
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