[英]Pass a overloaded function as a template
我有这个模板集
__Self &set(const char *name, lua_CFunction func)
{ return rawSet(name, FuncCall::create(func)); }
....
我用的是:
.set("child_value", &pugi::xml_node::child_value)
但是child_value超载了
const char_t* xml_node::child_value(const char_t* name) const
const char_t* xml_node::child_value() const
并且编译器给出了这个错误:
error C2668: 'SLB::Class<T,W>::set' : ambiguous call to overloaded function
我怎么能修复这个错误? 我想要child_value()版本。
我认为需要明确的演员:
.set( "child_value", static_cast<const char_t* (xml_node::*)() const>( &pugi::xml_node::child_value ) );
将typedef定义为:
typedef const char_t* (pugi::xml_node::*fn_pchar)(const char_t* name) const;
typedef const char_t* (pugi::xml_node::*fn_void)() const;
然后写:
//if you want to select first member function that takes parameter (char*)
set("child_value", (fn_pchar)&pugi::xml_node::child_value);
//^^^^^^^^ note this!
//if you want to select second member function that takes no parameter (void)
set("child_value", (fn_void)&pugi::xml_node::child_value);
//^^^^^^^ note this
好的,我自己做了。
typedef const char* (pugi::xml_node::*ChildValueFunctionType)(void) const; // const required!
ChildValueFunctionType ChildValuePointer = &pugi::xml_node::child_value;
然后,只是打电话
.set("child_value", ChildValuePointer)
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