MSVC error with constexpr array as template non-type parameter

Question

I'm trying to understand if what I'm seeing is an MSVC compiler bug or a misunderstanding on my part. I'm trying to use a simple compile-time string literal template parameter, like so:

constexpr const char teststr[] = "teststr";

template <const char *N>
struct Test {
  static constexpr const char *name = N;
};

using TEST = Test<teststr>;

However, MSVC reports that the teststr parameter is not a compile-time expression: error C2975: 'Test': invalid template argument for 'N', expected compile-time constant expression (on the using TEST line).

Is this my mistake, or a compiler bug? I am using Visual Studio 2017 version 15.1.

xskxzr · Accepted Answer · 2018-01-09 15:52:04Z

1

It is a compiler bug.

In addition, it is a C++11 feature to permit addresses of objects with internal linkage in template arguments, not C++14.

answered Jan 9, 2018 at 15:52

xskxzr

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Comments

Sid S · Accepted Answer · 2018-01-08 23:44:09Z

0

Is it important that name is static ?

This compiles with MSVC 2015:

char teststr[] = "teststr";

template <const char *N>
struct Test
{
    const char *name = N;
};

using TEST = Test<teststr>;

answered Jan 8, 2018 at 23:44

Sid S

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