catch2/tests/SelfTest/UsageTests/Compilation.tests.cpp

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// Copyright Catch2 Authors
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at
// https://www.boost.org/LICENSE_1_0.txt)
// SPDX-License-Identifier: BSL-1.0
#include <type_traits>
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// Setup for #1403 -- look for global overloads of operator << for classes
// in a different namespace.
#include <ostream>
namespace foo {
struct helper_1403 {
bool operator==(helper_1403) const { return true; }
};
}
namespace bar {
template <typename... Ts>
struct TypeList {};
}
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#ifdef __GNUC__
#pragma GCC diagnostic ignored "-Wmissing-declarations"
#endif
static std::ostream& operator<<(std::ostream& out, foo::helper_1403 const&) {
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return out << "[1403 helper]";
}
///////////////////////////////
#include <catch2/catch_test_macros.hpp>
#include <catch2/matchers/catch_matchers_string.hpp>
#include <cstring>
// Comparison operators can return non-booleans.
// This is unusual, but should be supported.
struct logic_t {
logic_t operator< (logic_t) const { return {}; }
logic_t operator<=(logic_t) const { return {}; }
logic_t operator> (logic_t) const { return {}; }
logic_t operator>=(logic_t) const { return {}; }
logic_t operator==(logic_t) const { return {}; }
logic_t operator!=(logic_t) const { return {}; }
explicit operator bool() const { return true; }
};
static void throws_int(bool b) {
if (b) {
throw 1;
}
}
template<typename T>
bool templated_tests(T t) {
int a = 3;
REQUIRE(a == t);
CHECK(a == t);
REQUIRE_THROWS(throws_int(true));
CHECK_THROWS_AS(throws_int(true), int);
REQUIRE_NOTHROW(throws_int(false));
REQUIRE_THAT("aaa", Catch::Matchers::EndsWith("aaa"));
return true;
}
struct A {};
static std::ostream &operator<<(std::ostream &o, const A &) { return o << 0; }
struct B : private A {
bool operator==(int) const { return true; }
};
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#ifdef __clang__
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunused-function"
#endif
#ifdef __GNUC__
// Note that because -~GCC~-, this warning cannot be silenced temporarily, by pushing diagnostic stack...
// Luckily it is firing in test files and thus can be silenced for the whole file, without losing much.
#pragma GCC diagnostic ignored "-Wunused-function"
#endif
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B f();
std::ostream g();
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#ifdef __clang__
#pragma clang diagnostic pop
#endif
template <typename, typename>
struct Fixture_1245 {};
// This is a minimal example for an issue we have found in 1.7.0
struct dummy_809 {
int i;
};
template<typename T>
bool operator==(const T& val, dummy_809 f) {
return val == f.i;
}
TEST_CASE("#809") {
dummy_809 f;
f.i = 42;
REQUIRE(42 == f);
}
// ------------------------------------------------------------------
// Changes to REQUIRE_THROWS_AS made it stop working in a template in
// an unfixable way (as long as C++03 compatibility is being kept).
// To prevent these from happening in the future, this needs to compile
TEST_CASE("#833") {
REQUIRE(templated_tests<int>(3));
}
// Test containing example where original stream insertable check breaks compilation
TEST_CASE("#872") {
A dummy;
CAPTURE(dummy);
B x;
REQUIRE (x == 4);
}
TEST_CASE("#1027: Bitfields can be captured") {
struct Y {
uint32_t v : 1;
};
Y y{ 0 };
REQUIRE(y.v == 0);
REQUIRE(0 == y.v);
}
// Comparison operators can return non-booleans.
// This is unusual, but should be supported.
TEST_CASE("#1147") {
logic_t t1, t2;
REQUIRE(t1 == t2);
REQUIRE(t1 != t2);
REQUIRE(t1 < t2);
REQUIRE(t1 > t2);
REQUIRE(t1 <= t2);
REQUIRE(t1 >= t2);
}
// unsigned array
TEST_CASE("#1238") {
unsigned char uarr[] = "123";
CAPTURE(uarr);
signed char sarr[] = "456";
CAPTURE(sarr);
REQUIRE(std::memcmp(uarr, "123", sizeof(uarr)) == 0);
REQUIRE(std::memcmp(sarr, "456", sizeof(sarr)) == 0);
}
TEST_CASE_METHOD((Fixture_1245<int, int>), "#1245", "[compilation]") {
SUCCEED();
}
TEST_CASE("#1403", "[compilation]") {
::foo::helper_1403 h1, h2;
REQUIRE(h1 == h2);
}
TEST_CASE("Optionally static assertions", "[compilation]") {
STATIC_REQUIRE( std::is_void<void>::value );
STATIC_REQUIRE_FALSE( std::is_void<int>::value );
STATIC_CHECK( std::is_void<void>::value );
STATIC_CHECK_FALSE( std::is_void<int>::value );
}
TEST_CASE("#1548", "[compilation]") {
using namespace bar;
REQUIRE(std::is_same<TypeList<int>, TypeList<int>>::value);
}
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// #925
using signal_t = void (*) (void*);
struct TestClass {
signal_t testMethod_uponComplete_arg = nullptr;
};
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namespace utility {
inline static void synchronizing_callback( void * ) { }
}
#if defined (_MSC_VER)
#pragma warning(push)
// The function pointer comparison below triggers warning because of
// calling conventions
#pragma warning(disable:4244)
#endif
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TEST_CASE("#925: comparing function pointer to function address failed to compile", "[!nonportable]" ) {
TestClass test;
REQUIRE(utility::synchronizing_callback != test.testMethod_uponComplete_arg);
}
#if defined (_MSC_VER)
#pragma warning(pop)
#endif
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TEST_CASE( "#1319: Sections can have description (even if it is not saved",
"[compilation]" ) {
SECTION( "SectionName", "This is a long form section description" ) {
SUCCEED();
}
}
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TEST_CASE("Lambdas in assertions") {
REQUIRE([]() { return true; }());
}
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namespace {
struct HasBitOperators {
int value;
friend HasBitOperators operator| (HasBitOperators lhs, HasBitOperators rhs) {
return { lhs.value | rhs.value };
}
friend HasBitOperators operator& (HasBitOperators lhs, HasBitOperators rhs) {
return { lhs.value & rhs.value };
}
friend HasBitOperators operator^ (HasBitOperators lhs, HasBitOperators rhs) {
return { lhs.value ^ rhs.value };
}
explicit operator bool() const {
return !!value;
}
friend std::ostream& operator<<(std::ostream& out, HasBitOperators val) {
out << "Val: " << val.value;
return out;
}
};
}
TEST_CASE("Assertion macros support bit operators and bool conversions", "[compilation][bitops]") {
HasBitOperators lhs{ 1 }, rhs{ 2 };
REQUIRE(lhs | rhs);
REQUIRE_FALSE(lhs & rhs);
REQUIRE(HasBitOperators{ 1 } & HasBitOperators{ 1 });
REQUIRE(lhs ^ rhs);
REQUIRE_FALSE(lhs ^ lhs);
}
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namespace {
struct ImmovableType {
ImmovableType() = default;
ImmovableType(ImmovableType const&) = delete;
ImmovableType& operator=(ImmovableType const&) = delete;
ImmovableType(ImmovableType&&) = delete;
ImmovableType& operator=(ImmovableType&&) = delete;
friend bool operator==(ImmovableType const&, ImmovableType const&) {
return true;
}
};
}
TEST_CASE("Immovable types are supported in basic assertions", "[compilation][.approvals]") {
REQUIRE(ImmovableType{} == ImmovableType{});
}
namespace adl {
struct always_true {
explicit operator bool() const { return true; }
};
#define COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(op) \
template <class T, class U> \
auto operator op (T&&, U&&) { \
return always_true{}; \
}
COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(==)
COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(!=)
COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(<)
COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(>)
COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(<=)
COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(>=)
COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(|)
COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(&)
COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR(^)
#undef COMPILATION_TEST_DEFINE_UNIVERSAL_OPERATOR
}
TEST_CASE("ADL universal operators don't hijack expression deconstruction", "[compilation][.approvals]") {
REQUIRE(adl::always_true{});
REQUIRE(0 == adl::always_true{});
REQUIRE(0 != adl::always_true{});
REQUIRE(0 < adl::always_true{});
REQUIRE(0 > adl::always_true{});
REQUIRE(0 <= adl::always_true{});
REQUIRE(0 >= adl::always_true{});
REQUIRE(0 | adl::always_true{});
REQUIRE(0 & adl::always_true{});
REQUIRE(0 ^ adl::always_true{});
}