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//===- STLExtrasTest.cpp - Unit tests for STL extras ----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
int f(rank<0>) { return 0; }
int f(rank<1>) { return 1; }
int f(rank<2>) { return 2; }
int f(rank<4>) { return 4; }
TEST(STLExtrasTest, Rank) {
// We shouldn't get ambiguities and should select the overload of the same
// rank as the argument.
EXPECT_EQ(0, f(rank<0>()));
EXPECT_EQ(1, f(rank<1>()));
EXPECT_EQ(2, f(rank<2>()));
// This overload is missing so we end up back at 2.
EXPECT_EQ(2, f(rank<3>()));
// But going past 3 should work fine.
EXPECT_EQ(4, f(rank<4>()));
// And we can even go higher and just fall back to the last overload.
EXPECT_EQ(4, f(rank<5>()));
EXPECT_EQ(4, f(rank<6>()));
}
}
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