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test: cover PTN_BIND 1/4/5 arity and PTN_WHERE 3/4 arg variants #42

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Merged
sentomk merged 1 commit into from
Jul 31, 2026
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test: cover PTN_BIND 1/4/5 arity and PTN_WHERE 3/4 arg variants #42

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180 changes: 180 additions & 0 deletions tests/tests_named_placeholder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -29,11 +29,33 @@ namespace {
int c;
};

struct Single {
int value;
};

struct Quad {
int a;
int b;
int c;
int d;
};

struct Penta {
int a;
int b;
int c;
int d;
int e;
};

// Declare named placeholders for each struct.
// These are namespace-scoped inline constexpr arg_t<N> objects.
PTN_BIND(Point, x, y);
PTN_BIND(Packet, type, len);
PTN_BIND(Triple, a, b, c);
PTN_BIND(Single, sv);
PTN_BIND(Quad, qa, qb, qc, qd);
PTN_BIND(Penta, pa, pb, pc, pd, pe);

} // namespace

Expand Down Expand Up @@ -224,3 +246,161 @@ TEST(NamedPlaceholder, MixedArithmeticAndComparison) {
ptn::_ >> 0);
EXPECT_EQ(result, 1);
}

// =========================================================================
// PTN_BIND arity coverage: 1, 4, and 5 member structs.
// =========================================================================

TEST(NamedPlaceholder, OneMemberTypeCorrect) {
static_assert(std::is_same_v<std::decay_t<decltype(sv)>,
ptn::pat::mod::arg_t<0>>);
}

TEST(NamedPlaceholder, OneMemberGuard) {
Single s{42};
auto result = ptn::match(s)
| PTN_ON(
ptn::$(ptn::has<&Single::value>)[sv > 5] >> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 1);
}

TEST(NamedPlaceholder, OneMemberGuardFails) {
Single s{3};
auto result = ptn::match(s)
| PTN_ON(
ptn::$(ptn::has<&Single::value>)[sv > 5] >> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 0);
}

TEST(NamedPlaceholder, FourMemberTypeCorrect) {
static_assert(std::is_same_v<std::decay_t<decltype(qa)>,
ptn::pat::mod::arg_t<0>>);
static_assert(std::is_same_v<std::decay_t<decltype(qd)>,
ptn::pat::mod::arg_t<3>>);
}

TEST(NamedPlaceholder, FourMemberGuard) {
// a + b + c == d
Quad q{1, 2, 3, 6};
auto result = ptn::match(q)
| PTN_ON(
ptn::$(ptn::has<&Quad::a,
&Quad::b,
&Quad::c,
&Quad::d>)[qa + qb + qc == qd]
>> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 1);
}

TEST(NamedPlaceholder, FourMemberGuardFails) {
Quad q{1, 2, 3, 7};
auto result = ptn::match(q)
| PTN_ON(
ptn::$(ptn::has<&Quad::a,
&Quad::b,
&Quad::c,
&Quad::d>)[qa + qb + qc == qd]
>> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 0);
}

TEST(NamedPlaceholder, FiveMemberTypeCorrect) {
static_assert(std::is_same_v<std::decay_t<decltype(pa)>,
ptn::pat::mod::arg_t<0>>);
static_assert(std::is_same_v<std::decay_t<decltype(pe)>,
ptn::pat::mod::arg_t<4>>);
}

TEST(NamedPlaceholder, FiveMemberGuard) {
// a * b - c == d + e
Penta p{6, 2, 5, 4, 3};
auto result = ptn::match(p)
| PTN_ON(
ptn::$(
ptn::has<&Penta::a,
&Penta::b,
&Penta::c,
&Penta::d,
&Penta::e>)[pa * pb - pc == pd + pe]
>> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 1);
}

TEST(NamedPlaceholder, FiveMemberGuardFails) {
Penta p{6, 2, 5, 4, 4};
auto result = ptn::match(p)
| PTN_ON(
ptn::$(
ptn::has<&Penta::a,
&Penta::b,
&Penta::c,
&Penta::d,
&Penta::e>)[pa * pb - pc == pd + pe]
>> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 0);
}

// =========================================================================
// PTN_WHERE arity coverage: 3 and 4 parameter variants.
// (1, 2, and 5 are already tested in tests_guard.cpp.)
// =========================================================================

TEST(NamedPlaceholder, WhereThreeArgGuard) {
// PTN_WHERE((a, b, c), a + b == c)
Triple t{2, 3, 5};
auto result = ptn::match(t)
| PTN_ON(
ptn::$(
ptn::has<&Triple::a, &Triple::b, &Triple::c>)
[PTN_WHERE((x, y, z), x + y == z)]
>> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 1);
}

TEST(NamedPlaceholder, WhereThreeArgGuardFails) {
Triple t{2, 3, 6};
auto result = ptn::match(t)
| PTN_ON(
ptn::$(
ptn::has<&Triple::a, &Triple::b, &Triple::c>)
[PTN_WHERE((x, y, z), x + y == z)]
>> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 0);
}

TEST(NamedPlaceholder, WhereFourArgGuard) {
// PTN_WHERE((a, b, c, d), a + b + c == d)
Quad q{1, 2, 3, 6};
auto result = ptn::match(q)
| PTN_ON(
ptn::$(ptn::has<&Quad::a,
&Quad::b,
&Quad::c,
&Quad::d>)
[PTN_WHERE((w, x, y, z), w + x + y == z)]
>> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 1);
}

TEST(NamedPlaceholder, WhereFourArgGuardFails) {
Quad q{1, 2, 3, 7};
auto result = ptn::match(q)
| PTN_ON(
ptn::$(ptn::has<&Quad::a,
&Quad::b,
&Quad::c,
&Quad::d>)
[PTN_WHERE((w, x, y, z), w + x + y == z)]
>> 1,
ptn::_ >> 0);
EXPECT_EQ(result, 0);
}
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