78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
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#include "sample_vectors.hpp"
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#include <gtest/gtest.h>
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namespace {
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void simplevec_double (vwr::SimpleVector3& parVec, float parX, float parY, float parZ) {
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EXPECT_EQ(parVec.x, parX);
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EXPECT_EQ(parVec.y, parY);
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EXPECT_EQ(parVec.z, parZ);
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parVec.x *= 2.0f;
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parVec.y *= 2.0f;
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parVec.z *= 2.0f;
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}
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} //unnamed namespace
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TEST(vwr, example) {
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using namespace vwr;
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//Using the bare vectors
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{
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//Imagine you get this vector from a function's return value.
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auto vec = TrailingDataVector3{2.0f, 5.5f, 3.8f, 1, 2};
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//Now you want to pass it on to a function from a different library.
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//To be safe, create a temporary of the correct type.
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//Was it lower case x, upper case, with or without paretheses?
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auto vec_b = SimpleVector3{vec.X, vec.Y, vec.Z};
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simplevec_double(vec_b, vec_b.x, vec_b.y, vec_b.z);
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//The above call changed the input vector, so re-assign it (vec_b is
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//just a converted copy, remember?)
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vec.X = vec_b.x;
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vec.Y = vec_b.y;
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vec.Z = vec_b.z;
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//Can't compare with vec == vec_b, so unroll it manually
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EXPECT_EQ(vec.X, vec_b.x);
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EXPECT_EQ(vec.Y, vec_b.y);
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EXPECT_EQ(vec.Z, vec_b.z);
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}
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//Using vectorwrapper
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{
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auto vec_in = TrailingDataVector3{2.0f, 5.5f, 3.8f, 1, 2};
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//In reality, I just wrote TrailingDataVector3's definition myself, but
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//I'm already spending time to fix the build as I call vec.x instead of
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//vec.X. Do you think it's a remote case? Think twice.
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EXPECT_EQ(vec_in.X, 2.0f);
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EXPECT_EQ(vec_in.Y, 5.5f);
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EXPECT_EQ(vec_in.Z, 3.8f);
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EXPECT_EQ(vec_in.a, 1);
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EXPECT_EQ(vec_in.b, 2);
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tvec3 vec(vec_in);
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EXPECT_EQ(vec.x(), 2.0f);
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EXPECT_EQ(vec.y(), 5.5f);
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EXPECT_EQ(vec.z(), 3.8f);
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//If you initialize vec from an object of the wrapped type, extra data
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//also gets initialized correctly. But I think in most situations you
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//won't need this.
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EXPECT_EQ(vec.data().a, 1);
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EXPECT_EQ(vec.data().b, 2);
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//Suppose TrailingDataVector3 is a third-party struct and I'm not
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//guaranteed it will never change. Sure I can reinterpret_cast it, as
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//much as I could reinterpret_cast a short int to a TrailingDataVector3.
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//The following line won't compile if casting is not deemed appropriate.
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simplevec_double(vec.cast<vwr::svec3>().data(), vec.x(), vec.y(), vec.z());
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//Well that's it.
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//If what you wanted is indeed a copy of type SimpleVector3, here we go:
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svec3 vec_b(vec);
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EXPECT_EQ(vec_b, vec);
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}
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}
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