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comparison clang/test/SemaTemplate/function-template-specialization.cpp @ 150:1d019706d866

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LLVM10
author anatofuz
date Thu, 13 Feb 2020 15:10:13 +0900
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147:c2174574ed3a 150:1d019706d866
1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2
3 template <int N>
4 void f0(int (&array)[N]); // expected-note {{candidate template ignored: could not match 'int' against 'char'}}
5
6 // Simple function template specialization (using overloading)
7 template<> void f0(int (&array)[1]);
8
9 void test_f0() {
10 int iarr1[1];
11 f0(iarr1);
12 }
13
14 // Function template specialization where there are no matches
15 template<> void f0(char (&array)[1]); // expected-error{{no function template matches}}
16 template<> void f0<2>(int (&array)[2]) { }
17
18 // Function template specialization that requires partial ordering
19 template<typename T, int N> void f1(T (&array)[N]); // expected-note{{matches}}
20 template<int N> void f1(int (&array)[N]); // expected-note{{matches}}
21
22 template<> void f1(float (&array)[1]);
23 template<> void f1(int (&array)[1]);
24
25 // Function template specialization that results in an ambiguity
26 template<typename T> void f1(T (&array)[17]); // expected-note{{matches}}
27 template<> void f1(int (&array)[17]); // expected-error{{ambiguous}}
28
29 // Resolving that ambiguity with explicitly-specified template arguments.
30 template<int N> void f2(double (&array)[N]);
31 template<typename T> void f2(T (&array)[42]);
32
33 template<> void f2<double>(double (&array)[42]);
34 template<> void f2<42>(double (&array)[42]);
35
36 void f2<25>(double (&array)[25]); // expected-error{{specialization}}
37
38 // PR5833
39 namespace PR5833 {
40 template <typename T> bool f0(T &t1);
41 template <> bool f0<float>(float &t1);
42 }
43 template <> bool PR5833::f0<float>(float &t1) {}
44
45 // PR8295
46 namespace PR8295 {
47 template <typename T> void f(T t) {}
48 template <typename T> void f<T*>(T* t) {} // expected-error{{function template partial specialization is not allowed}}
49 }
50
51 class Foo {
52 template<class T>
53 static void Bar(const T& input);
54
55 // Don't crash here.
56 template<>
57 static void Bar(const long& input) {} // expected-warning{{explicit specialization cannot have a storage class}}
58 };