C++ compile error when using std::apply with clang 4.0.0.

clang 4.0.0 has C++17 std::apply implementation. I confirmed that it works OK on my local LLVM 4.0.0 installation.

Following are test codes to reproduce the compile error. It fails with clang 4.0.0 and clang (trunk). But it succeeded with gcc 7.1 and gcc (snapshot).

Of course, I set -std=c++1z compiler option.

#include <tuple>

constexpr int add(int a, int b)
{
    return a + b;
}

static_assert(std::apply(&add, std::make_tuple(10, 20)) == 30);

[mattgodbolt]

Add the parameter -stdlib=libc++ to use clang’s library instead of the default GCC library. On Fri, May 26, 2017 at 1:24 AM, Gil Ho, Jang [e-mail] wrote:

clang 4.0.0 has C++17 std::apply implementation. I confirmed that it works OK on my local LLVM 4.0.0 installation.

Following are test codes to reproduce the compile error. It fails with clang 4.0.0 and clang (trunk). But it succeeded with gcc 7.1 and gcc (snapshot).

Of course, I set -std=c++1z compiler option.

#include <tuple> constexpr int add(int a, int b) { return a + b; } static_assert(std::apply(&add, std::make_tuple(10, 20)) == 30);

[image: screen shot 2017-05-26 at 3 22 22 pm] https://cloud.githubusercontent.com/assets/13075164/26483314/56663fca-4227-11e7-817b-d3d0f7e4020a.png

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[mattgodbolt]

Oh wow! I thought I’d already updated them to do so! Will do that at least!!! Thanks 😃