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I have code like this:
template <typename T, typename U> struct MyStruct { T aType; U anotherType; }; class IWantToBeFriendsWithMyStruct { friend struct MyStruct; //what is the correct syntax here ? };
What is the correct syntax to give friendship...
Started by David on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
IWantToBeFriendsWithMyStruct { template <typename T, typename U> friend struct MyStruct; };
Works in VS2008 be
class IWantToBeFriendsWithMyStruct { template <typename T, typename U> friend struct MyStruct; }.
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I have a template class defined as follow :
template <class T1, class T2> class MyClass { };
In this class, I need a struct that contains one member of type T1. How can I do that ?
I tried the following, but it didn't work :
template <class T...
Started by Wookai on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
template <class T1> struct myStruct{ T1 templateMember; // rest of members }; template < };
Just remove typedef:
template <class T1, class T2> class MyClass { struct myStruct{ T1 templateMember; // rest....
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I am specializing the 'less' (predicate) for a data type.
The code looks like this:
template<> struct std::less<DateTimeKey> { bool operator()(const DateTimeKey& k1, const DateTimeKey& k2) const { // Some code ... } }
When compiling (g++ 4...
Started by Stick it to THE MAN on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
So
struct A { A(int _v=0):v(_v){} int v; }; template<> struct less<A> { bool operator()(const A& k1, const A& k2) const { return k1.v < k2.v template specializations for....
Functor doesn't have to be in std namespace.
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Ask your Facebook Friends
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I have a template struct tree_parse_info declared as follows:
template < typename IteratorT, typename NodeFactoryT, typename T > struct tree_parse_info { // ... };
The compiler allows the follows code:
tree_parse_info<> m_info;
Why does this...
Started by veeru on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
struct array; // actual definition template <typename T , size_t N> struct array {}; int main(void = 10> struct array; // error: redefinition of default parameter template <typename T = double accidentally....
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Is there an easier way to display the struct fields and their corresponding values in RichEdit control?
This is what I am doing now:
AnsiString s; s = IntToStr(wfc.fontColor); RichEdit1->Lines->Append(s);
etc...
Is there an easier way than having...
Started by Changeling on
, 10 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
I suggest creating templated methods for writing to the text box:
template <_To_Textbox(member1, "member1", textbox....
Richedit_stream(TRichEditControl &trc) : ctrl(trc) {} template <class T> richedit_stream minimal investment.
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Hi all! I have the following class CppProperty class that holds value:
template<typename TT> class CppProperty { TT val; public: CppProperty(void) { } CppProperty(TT aval) : val(aval) { } CppProperty(const CppProperty & rhs) { this->val = rhs...
Started by Viet on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
You'd need a conversion operator:
operator const TT&(void) const { return val; } operator TT&(void) { return val; }
There is a brief tutorial on conversion operators... .
You need to provide operator int() to your class to allow the implicit conversion to int .
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Let's suppose I have a struct like this:
struct my_struct { int a; int b; }
I have a function which should set a new value for either "a" or "b". This function also requires to specify which variable to set. A typical example would be like this:
void ...
Started by happy_emi on
, 9 posts
by 8 people.
Answer Snippets (Read the full thread at stackoverflow):
struct ctmap;
We then specialise this for the case where there are no fields:
template <>You can't use templates to solve this, but why use a struct in te first place? This seems like of a struct/class that does....
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Hello!
How can I do something like that (just an example):
any_struct *my_struct = create_struct(); add_struct_member(my_struct, "a", int_member); add_struct_member(my_struct, "b", float_member);
So that I could load and use a struct instance "from the...
Answer Snippets (Read the full thread at stackoverflow):
The "insance" method will essentially create a new hashtable with equal number of members as the template hashtable....
The "create_struct of the struct.
Of discussion I'm just going to assume you have some sort of hashtable available .
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This doesn't compile:
template<class X> struct A { template<int I> void f() {} }; template<class T> void g() { A<T> a; a.f<3>(); // Compilation fails here (Line 18) } int main(int argc, char *argv[]) { g<int>(); // ...
Started by Ari on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Or ->-expression or qualified-id explicitly....
T> void g() { A<T> a; a.template f<3>(); // add `template` keyword here }
According to C++'03 Standard 14.2/4:
When the name of a member template specialization appears after .
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MSDN says that you should use structs when you need lightweight objects. Are there any other scenarios when a struct is preferable over a class?
Edit:
Some people have forgotten that:
1. structs can have methods!
2. structs have no inheritance capabilites...
Started by Esteban Araya on
, 12 posts
by 12 people.
Answer Snippets (Read the full thread at stackoverflow):
Structs are copy-the-difference-between-struct....
Time one might choose struct instead of class is for template metaprogramming as shorthand for classUse a struct when you want value-type semantics instead of reference-type.
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