Substitution failure is not an error: Difference between revisions

Revision as of 11:30, 30 July 2011

Revision as of 00:49, 2 August 2011

Line 7:

<source lang="cpp">

struct Test
{

typedef int type;

};

template < typename T >

void f(typename T::type) {} // definition #1

template < typename T >

void f(T) {} // definition #2

int main()
{

f<Test>(10); // call #1

f<int>(10); // call #2 without error thanks to SFINAE

Line 33 ⟶ 35:

template <typename T>

struct has_typedef_type
{

// yes and no are guaranteed to have different sizes,

// specifically sizeof(yes) == 1 and sizeof(no) == 2

Line 50 ⟶ 53:

};

struct foo
{

typedef float type;

};

int main()
{

std::cout << std::boolalpha;

std::cout << has_typedef_type<int>::value << std::endl;