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Close #69 Unused Var: Warning #76

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Merged
merged 1 commit into from
Jan 21, 2016
Merged

Close #69 Unused Var: Warning #76

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10 changes: 6 additions & 4 deletions include/pybind11/attr.h
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Original file line number Diff line number Diff line change
Expand Up @@ -250,24 +250,26 @@ template <int Nurse, int Patient> struct process_attribute<keep_alive<Nurse, Pat
static void postcall(handle args, handle ret) { keep_alive_impl(Nurse, Patient, args, ret); }
};

/// Ignore that a variable is unused in compiler warnings
template<class T> void ignore_unused(const T&) { }

/// Recursively iterate over variadic template arguments
template <typename... Args> struct process_attributes {
static void init(const Args&... args, function_record *r) {
int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::init(args, r), 0) ... };
(void) unused; (void) r;
ignore_unused(unused);
}
static void init(const Args&... args, type_record *r) {
int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::init(args, r), 0) ... };
(void) unused; (void) r;
ignore_unused(unused);
}
static void precall(handle fn_args) {
int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::precall(fn_args), 0) ... };
(void) unused; (void) fn_args;
ignore_unused(unused);
}
static void postcall(handle fn_args, handle fn_ret) {
int unused[] = { 0, (process_attribute<typename std::decay<Args>::type>::postcall(fn_args, fn_ret), 0) ... };
(void) unused; (void) fn_args; (void) fn_ret;
ignore_unused(unused);
}
};

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