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Add foreach emulation for older compilers (#1138)

This commit is contained in:
Paul Fultz II 2018-03-28 21:51:22 -05:00 committed by Daniel Marjamäki
parent e1c7507204
commit 70da3acb70
2 changed files with 251 additions and 0 deletions
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91
lib/foreach.h Normal file
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2018 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
//---------------------------------------------------------------------------
#ifndef foreachH
#define foreachH
//---------------------------------------------------------------------------
#include <cstdlib>
#ifndef CPPCHECK_HAS_RANGE_FOR
#if (defined(__GNUC__) && !defined (__clang__) && __GNUC__ == 4 && __GNUC_MINOR__ < 6) || defined(_MSC_VER)
#define CPPCHECK_HAS_RANGE_FOR 0
#else
#define CPPCHECK_HAS_RANGE_FOR 1
#endif
#endif
#if !CPPCHECK_HAS_RANGE_FOR
template<class Range>
typename Range::iterator range_begin(Range& r)
{
return r.begin();
}
template<class Range>
typename Range::iterator range_end(Range& r)
{
return r.end();
}
template<class Range>
typename Range::const_iterator range_begin(const Range& r)
{
return r.begin();
}
template<class Range>
typename Range::const_iterator range_end(const Range& r)
{
return r.end();
}
template< class T, std::size_t N >
T* range_begin( T (&array)[N] )
{
return array;
}
template< class T, std::size_t N >
T* range_end( T (&array)[N] )
{
return array+N;
}
#define CPPCHECK_PRIVATE_VAR_CAT_IMPL(x, y) x ## y
#define CPPCHECK_PRIVATE_VAR_CAT(x, y) CPPCHECK_PRIVATE_VAR_CAT_IMPL(x, y)
#define CPPCHECK_PRIVATE_VAR(x) CPPCHECK_PRIVATE_VAR_CAT(_cppcheck_ ## x, __LINE__)
#define FOREACH(VAR, ...) \
if(bool CPPCHECK_PRIVATE_VAR(done) = false) {} \
else for(auto && CPPCHECK_PRIVATE_VAR(rng) = (__VA_ARGS__); !CPPCHECK_PRIVATE_VAR(done);) \
for(auto CPPCHECK_PRIVATE_VAR(begin) = range_begin(CPPCHECK_PRIVATE_VAR(rng)); !CPPCHECK_PRIVATE_VAR(done); \
CPPCHECK_PRIVATE_VAR(done) = true) \
for(auto CPPCHECK_PRIVATE_VAR(end) = range_end(CPPCHECK_PRIVATE_VAR(rng)); \
!CPPCHECK_PRIVATE_VAR(done) && CPPCHECK_PRIVATE_VAR(begin) != CPPCHECK_PRIVATE_VAR(end); ++CPPCHECK_PRIVATE_VAR(begin)) \
if(!(CPPCHECK_PRIVATE_VAR(done) = true)) {} \
else for(VAR = *CPPCHECK_PRIVATE_VAR(begin); CPPCHECK_PRIVATE_VAR(done); CPPCHECK_PRIVATE_VAR(done) = false) \
#else
#define FOREACH(VAR, ...) for(VAR : (__VA_ARGS__))
#endif
#endif

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test/testforeach.cpp Normal file
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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2017 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "foreach.h"
#include "testsuite.h"
#include <vector>
class TestForeach : public TestFixture {
public:
TestForeach()
: TestFixture("TestForeach"), getVectorOnceCount(0)
{}
private:
int getVectorOnceCount;
const std::vector<int>& getVectorOnce()
{
static std::vector<int> v(5, 2);
getVectorOnceCount++;
return v;
}
std::vector<int> getVector()
{
std::vector<int> v(5, 2);
return v;
}
void run() {
TEST_CASE(container);
TEST_CASE(rvalue);
TEST_CASE(checkBreak);
TEST_CASE(checkContinue);
TEST_CASE(arrays);
TEST_CASE(callOnce);
TEST_CASE(nested);
}
void container() {
std::vector<int> v(5, 2);
int total = 0;
int count = 0;
FOREACH(int x, v) {
count++;
total += x;
}
ASSERT_EQUALS(total, 10);
ASSERT_EQUALS(count, 5);
}
void rvalue() {
int total = 0;
int count = 0;
FOREACH(int x, getVector()) {
count++;
total += x;
}
ASSERT_EQUALS(total, 10);
ASSERT_EQUALS(count, 5);
}
void checkBreak() {
std::vector<int> v(5, 2);
int total = 0;
int count = 0;
FOREACH(int x, v) {
count++;
if (count == 3) break;
total += x;
}
ASSERT_EQUALS(total, 4);
ASSERT_EQUALS(count, 3);
}
void checkContinue() {
std::vector<int> v(5, 2);
int total = 0;
int count = 0;
FOREACH(int x, v) {
count++;
if (count == 3) continue;
total += x;
}
ASSERT_EQUALS(total, 8);
ASSERT_EQUALS(count, 5);
}
void arrays() {
int arr[] = {2, 2, 2, 2, 2};
int total = 0;
int count = 0;
FOREACH(int x, arr) {
count++;
total += x;
}
ASSERT_EQUALS(total, 10);
ASSERT_EQUALS(count, 5);
}
void callOnce() {
int total = 0;
int count = 0;
FOREACH(int x, getVectorOnce()) {
count++;
total += x;
}
ASSERT_EQUALS(total, 10);
ASSERT_EQUALS(count, 5);
ASSERT_EQUALS(getVectorOnceCount, 1);
}
void nested() {
std::vector<int> v(5, 2);
int total = 0;
int count = 0;
FOREACH(int x, v) {
FOREACH(int y, v) {
count++;
total += x;
(void)y;
}
}
ASSERT_EQUALS(total, 50);
ASSERT_EQUALS(count, 25);
}
};
REGISTER_TEST(TestForeach)