util/generic/function_ut.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69

#include "function.h" 
#include "typetraits.h" 
 
#include <library/cpp/testing/unittest/registar.h>
 
Y_UNIT_TEST_SUITE(TestFunctionSignature) {
    int FF(double x) { 
        return (int)x; 
    } 
 
    int FFF(double x, char xx) { 
        return (int)x + (int)xx; 
    } 
 
    struct A { 
        int F(double x) { 
            return FF(x); 
        } 
    }; 
 
    Y_UNIT_TEST(TestPlainFunc) {
        UNIT_ASSERT_TYPES_EQUAL(TFunctionSignature<decltype(FF)>, decltype(FF)); 
    } 
 
    Y_UNIT_TEST(TestMethod) {
        UNIT_ASSERT_TYPES_EQUAL(TFunctionSignature<decltype(&A::F)>, decltype(FF)); 
    } 
 
    Y_UNIT_TEST(TestLambda) {
        auto f = [](double x) -> int { 
            return FF(x); 
        }; 
 
        UNIT_ASSERT_TYPES_EQUAL(TFunctionSignature<decltype(f)>, decltype(FF)); 
    } 
 
    Y_UNIT_TEST(TestFunction) {
        std::function<int(double)> f(FF);
 
        UNIT_ASSERT_TYPES_EQUAL(TFunctionSignature<decltype(f)>, decltype(FF)); 
    } 
 
    template <class F> 
    void TestCT() { 
#define FA(x) TFunctionArg<F, x> 
 
        UNIT_ASSERT_TYPES_EQUAL(FA(0), double); 
        UNIT_ASSERT_TYPES_EQUAL(FA(1), char); 
        UNIT_ASSERT_TYPES_EQUAL(TFunctionResult<F>, int); 
 
#undef FA 
    } 
 
    Y_UNIT_TEST(TestTypeErasureTraits) {
        TestCT<std::function<int(double, char)>>(); 
    } 
 
    Y_UNIT_TEST(TestPlainFunctionTraits) {
        TestCT<decltype(FFF)>(); 
    } 
 
    Y_UNIT_TEST(TestLambdaTraits) {
        auto fff = [](double xx, char xxx) -> int { 
            return FFF(xx, xxx); 
        }; 
 
        TestCT<decltype(fff)>(); 
    } 
}