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except: automatically detect ValueT for try_value

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This commit is contained in:
Danny Robson 2017-09-07 12:49:58 +10:00
parent d2472e229c
commit acedac53d0
1 changed files with 10 additions and 3 deletions
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13
except.hpp
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@ -64,13 +64,20 @@ namespace cruft::vk {
} }
/// requests a ValueT using a invokable FuncT with arguments /// returns a ValueT using an invokable FuncT with arguments
/// [Args..., &ValueT] and returns the result after testing for /// [Args..., &ValueT] and returns the result after testing for
/// success. /// success.
template <typename ValueT, typename FuncT, typename ...Args> template <typename FuncT, typename ...Args>
static ValueT static auto
try_query (FuncT &&func, Args &&...args) try_query (FuncT &&func, Args &&...args)
{ {
using ValueT = std::remove_pointer_t<
std::tuple_element_t<
sizeof... (Args),
typename func_traits<FuncT>::argument_types
>
>;
ValueT value; ValueT value;
try_func (func, std::forward<Args> (args)..., &value); try_func (func, std::forward<Args> (args)..., &value);
return value; return value;