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C++: Use a static_assert to detect Slint version mismatch

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cc #2909 , #223

New message:
```
/home/olivier/slint/build2/examples/gallery/gallery.h:6:73: error: static assertion failed: This file was generated with Slint compiler version 1.1.1, but the Slint library used is 1.1.0. The version numbers must match exactly.
    6 | static_assert(1 == SLINT_VERSION_MAJOR && 1 == SLINT_VERSION_MINOR && 1 == SLINT_VERSION_PATCH, "This file was generated with Slint compiler version 1.1.1, but the Slint library used is " SLINT_VERSION_STRING ". The version numbers must match exactly.");
/home/olivier/slint/build2/examples/gallery/gallery.h:6:73: note: the comparison reduces to ‘(1 == 0)’
```

Previous message:
```
/home/olivier/slint/build2/examples/printerdemo/cpp/printerdemo.h:12218:161: error: conversion from ‘VersionCheckHelper<[...],[...],0>’ to non-scalar type ‘VersionCheckHelper<[...],[...],1>’ requested
12218 | [[maybe_unused]] constexpr slint::private_api::VersionCheckHelper<1, 1, 1> THE_SAME_VERSION_MUST_BE_USED_FOR_THE_COMPILER_AND_THE_RUNTIME = slint::private_api::VersionCheckHelper<SLINT_VERSION_MAJOR, SLINT_VERSION_MINOR, SLINT_VERSION_PATCH>();
      |                                                                                                                                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/olivier/slint/build2/examples/printerdemo/cpp/printerdemo.h:12218:161: error: could not convert ‘slint::private_api::VersionCheckHelper<1, 1, 0>()’ from ‘VersionCheckHelper<[...],[...],0>’ to ‘VersionCheckHelper<[...],[...],1>’
12218 | [[maybe_unused]] constexpr slint::private_api::VersionCheckHelper<1, 1, 1> THE_SAME_VERSION_MUST_BE_USED_FOR_THE_COMPILER_AND_THE_RUNTIME = slint::private_api::VersionCheckHelper<SLINT_VERSION_MAJOR, SLINT_VERSION_MINOR, SLINT_VERSION_PATCH>();
      |                                                                                                                                                                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                                                                                                                                                 |
      |                                                                                                                                                                 VersionCheckHelper<[...],[...],0>
```
This commit is contained in:
Olivier Goffart 2023-06-28 13:26:41 +02:00 • committed by Olivier Goffart
parent 6c5f6da473
commit 331e5713c2
3 changed files with 23 additions and 19 deletions
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3
api/cpp/include/slint.h
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@ -1509,8 +1509,9 @@ cbindgen_private::NativeStyleMetrics::~NativeStyleMetrics()
#endif // !defined(DOXYGEN)
namespace private_api {
// Was used in Slint <= 1.1.0 to have an error message in case of mismatch
template<int Major, int Minor, int Patch>
struct VersionCheckHelper
struct [[deprecated]] VersionCheckHelper
{
};
}