diff options
| author | Karen Arutyunov <karen@codesynthesis.com> | 2018-11-02 17:16:31 +0300 |
|---|---|---|
| committer | Karen Arutyunov <karen@codesynthesis.com> | 2018-11-02 17:16:31 +0300 |
| commit | d9af320fbdfdadd70815d4f14a9116829dfabdf0 (patch) | |
| tree | 38e407df0aa9f728eaaa4437d7baa87a8a9447ee | |
| parent | 1bd2a072d44893b78eac97ee81edd24023918e06 (diff) | |
Generalize function_cast() to cast between incompatible function pointers
| -rw-r--r-- | libbutl/utility.ixx | 6 | ||||
| -rw-r--r-- | libbutl/utility.mxx | 7 |
2 files changed, 7 insertions, 6 deletions
diff --git a/libbutl/utility.ixx b/libbutl/utility.ixx index e17462a..1aa116b 100644 --- a/libbutl/utility.ixx +++ b/libbutl/utility.ixx @@ -213,11 +213,11 @@ namespace butl return nullopt; } - template <typename F> + template <typename F, typename P> inline F - function_cast (void* p) + function_cast (P* p) { - union { void* p; F f; } r; + union { P* p; F f; } r; r.p = p; return r.f; } diff --git a/libbutl/utility.mxx b/libbutl/utility.mxx index f944599..5d093ad 100644 --- a/libbutl/utility.mxx +++ b/libbutl/utility.mxx @@ -315,11 +315,12 @@ LIBBUTL_MODEXPORT namespace butl F f_; }; - // Cleanly cast dlsym() result (void*) to a function pointer. + // Cleanly cast between incompatible function types or dlsym() result + // (void*) to a function pointer. // - template <typename F> + template <typename F, typename P> F - function_cast (void*); + function_cast (P*); // Call a function if there is an exception. // |