The following code will not compile with icpc 15.0.2:
#include <algorithm>
#include <array>
#include <numeric>
template<typename T>
T const & (*maxer) (T const &, T const &) = std::max<T>;
int main(void) {
std::array<float, 8> data;
std::iota(data.begin(), data.end(), 0.0f);
if (std::accumulate(data.begin(), data.end(), 0.0f, maxer<float>) == 7.0f) {
return 0;
} else {
return 1;
}
}
Here is the output:
$ icpc -std=c++14 -Wall -Wextra max.cc
max.cc(6): error: "maxer" is not a function or static data member
T const & (*maxer) (T const &, T const &) = std::max<T>;
^
max.cc(11): error: identifier "maxer" is undefined
if (std::accumulate(data.begin(), data.end(), 0.0f, maxer<float>) == 7.0f) {
^
max.cc(11): error: type name is not allowed
if (std::accumulate(data.begin(), data.end(), 0.0f, maxer<float>) == 7.0f) {
^
max.cc(11): error: expected an expression
if (std::accumulate(data.begin(), data.end(), 0.0f, maxer<float>) == 7.0f) {
^
compilation aborted for max.cc (code 2)
This code compiles successfully under clang++ and g++. As far as I can tell it is completely standards complaint. I suspect this is just a bug. I can work around it in the meantime by removing the template and hard-coding a type.
