Clash Royale CLAN TAG#URR8PPP

GoogleTest with Templates

Hope this question will not be too stupid. I'm quite new in using gtest and it's been quite a very long time that I don't make use of C++.
Let suppose w have this simplistic template Point class:

Point

template <class T>
struct Point

union

T _data [2];
struct T x, y; ;
;
constexpr Point(T x_, T y_) noexcept : x(x_), y(x_)
;


Then using gtest, I'm trying to check if Point is default constructible:

Point

TEST_P(PointTest,Concept)

ASSERT_TRUE(std::is_nothrow_constructible<Point<float>,float,float>::value);



Then I get this compilation error with Clang 6.0.1 with C++11 flags:

"error: too many arguments provided to function-like macro invocation"


Any help will be welcome. I do know that special care must be taken when combining templates and googletest. But I didn't figure out a solution.
Thank you !

1 Answer
1

I suppose it's a problem with C++ preprocessor that recognize the commas between templates arguments

// ...................................................v.....v
ASSERT_TRUE(std::is_nothrow_constructible<Point<float>,float,float>::value);


as macros arguments separators.

I suggest to calculate the value outside the macro call

TEST_P(PointTest,Concept)

constexpr auto val
= std::is_nothrow_constructible<Point<float>, float, float>::value;

ASSERT_TRUE( val );



or to pass through a using for the type

using

TEST_P(PointTest ,Concept)

using inc = std::is_nothrow_constructible<Point<float>, float, float>;

ASSERT_TRUE( inc::value );



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