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increment check

This commit is contained in:
Debrard Sebastien 2010-10-12 19:54:39 +02:00
parent 9e15c4ef38
commit 1a4e3dcc44
7 changed files with 541 additions and 146 deletions
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8
Makefile
View File

@ -28,6 +28,7 @@ LIBOBJ = lib/checkautovariables.o \
lib/checkexceptionsafety.o \
lib/checkmemoryleak.o \
lib/checkobsoletefunctions.o \
lib/checkpostfixoperator.o \
lib/checkother.o \
lib/checkstl.o \
lib/checkunusedfunctions.o \
@ -65,6 +66,7 @@ TESTOBJ = test/options.o \
test/testmathlib.o \
test/testmemleak.o \
test/testobsoletefunctions.o \
test/testpostfixoperator.o \
test/testoptions.o \
test/testother.o \
test/testpreprocessor.o \
@ -141,6 +143,9 @@ lib/checkmemoryleak.o: lib/checkmemoryleak.cpp lib/checkmemoryleak.h lib/check.h
lib/checkobsoletefunctions.o: lib/checkobsoletefunctions.cpp lib/checkobsoletefunctions.h lib/check.h lib/token.h lib/tokenize.h lib/settings.h lib/errorlogger.h
$(CXX) $(CXXFLAGS) -Ilib -c -o lib/checkobsoletefunctions.o lib/checkobsoletefunctions.cpp
lib/checkpostfixoperator.o: lib/checkpostfixoperator.cpp lib/checkpostfixoperator.h lib/check.h lib/token.h lib/tokenize.h lib/settings.h lib/errorlogger.h
$(CXX) $(CXXFLAGS) -Ilib -c -o lib/checkpostfixoperator.o lib/checkpostfixoperator.cpp
lib/checkother.o: lib/checkother.cpp lib/checkother.h lib/check.h lib/token.h lib/tokenize.h lib/settings.h lib/errorlogger.h lib/mathlib.h lib/executionpath.h
$(CXX) $(CXXFLAGS) -Ilib -c -o lib/checkother.o lib/checkother.cpp
@ -246,6 +251,9 @@ test/testmemleak.o: test/testmemleak.cpp lib/tokenize.h lib/checkmemoryleak.h li
test/testobsoletefunctions.o: test/testobsoletefunctions.cpp lib/tokenize.h lib/checkobsoletefunctions.h lib/check.h lib/token.h lib/settings.h lib/errorlogger.h test/testsuite.h test/redirect.h
$(CXX) $(CXXFLAGS) -Ilib -Icli -c -o test/testobsoletefunctions.o test/testobsoletefunctions.cpp
test/testpostfixoperator.o: test/testpostfixoperator.cpp lib/tokenize.h lib/checkpostfixoperator.h lib/check.h lib/token.h lib/settings.h lib/errorlogger.h test/testsuite.h test/redirect.h
$(CXX) $(CXXFLAGS) -Ilib -Icli -c -o test/testpostfixoperator.o test/testpostfixoperator.cpp
test/testoptions.o: test/testoptions.cpp test/options.h test/testsuite.h lib/errorlogger.h test/redirect.h
$(CXX) $(CXXFLAGS) -Ilib -Icli -c -o test/testoptions.o test/testoptions.cpp

39
lib/checkother.cpp
View File

@ -3937,39 +3937,6 @@ void CheckOther::checkMisusedScopedObject()
}
}
void CheckOther::postIncrement()
{
if (!_settings->_checkCodingStyle || !_settings->inconclusive)
return;
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
{
if (Token::simpleMatch(tok, "for ("))
{
const Token *tok2 = tok->next()->link();
if (tok2)
tok2 = tok2->tokAt(-3);
if (Token::Match(tok2, "; %var% ++|-- )"))
{
if (tok2->next()->varId() == 0)
continue;
// Take a look at the variable declaration
const Token *decltok = Token::findmatch(_tokenizer->tokens(), "%varid%", tok2->tokAt(1)->varId());
const std::string classDef = std::string("class ") + std::string(decltok->previous()->strAt(0));
// Is the variable an iterator?
if (decltok && Token::Match(decltok->previous(), "iterator|const_iterator"))
postIncrementError(tok2, tok2->strAt(1), (std::string("++") == tok2->strAt(2)));
// Is the variable a class?
else if (Token::findmatch(_tokenizer->tokens(), classDef.c_str()))
postIncrementError(tok2, tok2->strAt(1), (std::string("++") == tok2->strAt(2)));
}
}
}
}
void CheckOther::cstyleCastError(const Token *tok)
{
reportError(tok, Severity::style, "cstyleCast", "C-style pointer casting");
@ -4096,12 +4063,6 @@ void CheckOther::mathfunctionCallError(const Token *tok, const unsigned int numP
reportError(tok, Severity::error, "wrongmathcall", "Passing value " " to " "() leads to undefined result");
}
void CheckOther::postIncrementError(const Token *tok, const std::string &var_name, const bool isIncrement)
{
std::string type = (isIncrement ? "Incrementing" : "Decrementing");
reportError(tok, Severity::style, "postIncrementDecrement", ("Pre-" + type + " variable '" + var_name + "' is preferred to Post-" + type));
}
void CheckOther::emptyStringTestError(const Token *tok, const std::string &var_name, const bool isTestForEmpty)
{
if (isTestForEmpty)

7
lib/checkother.h
View File

@ -75,7 +75,6 @@ public:
checkOther.checkConstantFunctionParameter();
checkOther.checkIncompleteStatement();
checkOther.checkEmptyStringTest();
checkOther.postIncrement();
checkOther.invalidFunctionUsage();
checkOther.checkZeroDivision();
@ -156,9 +155,6 @@ public:
/** @brief %Check for parameters given to math function that do not make sense*/
void checkMathFunctions();
/** @brief %Check for post increment/decrement in for loop*/
void postIncrement();
void lookupVar(const Token *tok1, const std::string &varname);
/** @brief %Check for inefficient empty string test*/
@ -212,7 +208,6 @@ public:
void uninitvarError(const Token *tok, const std::string &varname);
void zerodivError(const Token *tok);
void mathfunctionCallError(const Token *tok, const unsigned int numParam = 1);
void postIncrementError(const Token *tok, const std::string &var_name, const bool isIncrement);
void emptyStringTestError(const Token *tok, const std::string &var_name, const bool isTestForEmpty);
void fflushOnInputStreamError(const Token *tok, const std::string &varname);
void redundantAssignmentInSwitchError(const Token *tok, const std::string &varname);
@ -252,8 +247,6 @@ public:
assignmentInAssertError(0, "varname");
invalidScanfError(0);
// optimisations
postIncrementError(0, "varname", true);
emptyStringTestError(0, "varname", true);
}

84
lib/checkpostfixoperator.cpp Normal file
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@ -0,0 +1,84 @@
/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 Daniel Marjamäki and 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/>.
*/
//---------------------------------------------------------------------------
// You should use ++ and -- as prefix whenever possible as these are more
// efficient than postfix operators
//---------------------------------------------------------------------------
#include "checkpostfixoperator.h"
#include <string>
//---------------------------------------------------------------------------
// Register this check class (by creating a static instance of it)
namespace
{
CheckPostfixOperator instance;
}
void CheckPostfixOperator::postfixOperator()
{
if (!_settings->_checkCodingStyle)
return;
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next())
{
bool result = false;
if ( Token::Match(tok, "++|--") ) {
if ( Token::Match(tok->previous()->previous(), ";|{|}") && Token::Match(tok->next(), ";|)|,") ) {
result = true;
}
else if (tok->strAt(-2) == ",") {
unsigned int i(1);
while(tok->strAt(i) != ")") {
if(tok->strAt(i) == ";") {
result = true;
break;
}
++i;
}
}
else if (tok->strAt(-2) == "<<" && tok->strAt(1) == "<<") {
result = true;
}
}
if(result) {
const Token *decltok = Token::findmatch(_tokenizer->tokens(), "%varid%", tok->previous()->varId());
if (decltok && Token::Match(decltok->previous(), "iterator|const_iterator|reverse_iterator|const_reverse_iterator")) {
// the variable an iterator
postfixOperatorError(tok);
}
else {
const std::string classDef = std::string("class ") + std::string(decltok->previous()->strAt(0));
if (Token::findmatch(_tokenizer->tokens(), classDef.c_str())) {
postfixOperatorError(tok);
}
}
}
}
}
//---------------------------------------------------------------------------
void CheckPostfixOperator::postfixOperatorError(const Token *tok)
{
reportError(tok, Severity::style, "postfixOperator", "You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators");
}

77
lib/checkpostfixoperator.h Normal file
View File

@ -0,0 +1,77 @@
/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 Daniel Marjamäki and 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 CheckPostfixOperatorH
#define CheckPostfixOperatorH
//---------------------------------------------------------------------------
#include "check.h"
/// @addtogroup Checks
/// @{
/**
* @brief Using postfix operators ++ or -- rather than postfix operator.
*/
class CheckPostfixOperator : public Check
{
public:
/** This constructor is used when registering the CheckPostfixOperator */
CheckPostfixOperator() : Check()
{ }
/** This constructor is used when running checks. */
CheckPostfixOperator(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
: Check(tokenizer, settings, errorLogger)
{ }
void runSimplifiedChecks(const Tokenizer *tokenizer, const Settings *settings, ErrorLogger *errorLogger)
{
CheckPostfixOperator checkPostfixOperator(tokenizer, settings, errorLogger);
checkPostfixOperator.postfixOperator();
}
/** Check postfix operators */
void postfixOperator();
private:
/** Report Error */
void postfixOperatorError(const Token *tok);
void getErrorMessages()
{
postfixOperatorError(0);
}
std::string name() const
{
return "Using postfix operators";
}
std::string classInfo() const
{
return "Warn if using postfix operators ++ or -- rather than prefix operator\n";
}
};
/// @}
//---------------------------------------------------------------------------
#endif

100
test/testother.cpp
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@ -83,9 +83,6 @@ private:
TEST_CASE(oldStylePointerCast);
TEST_CASE(postIncrementDecrementStl);
TEST_CASE(postIncrementDecrementClass);
TEST_CASE(dangerousStrolUsage);
TEST_CASE(passedByValue);
@ -2380,103 +2377,6 @@ private:
ASSERT_EQUALS("", errout.str());
}
void checkpostIncrementDecrement(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.setVarId();
// Clear the error buffer..
errout.str("");
// Check for redundant code..
Settings settings;
settings._checkCodingStyle = true;
settings.inconclusive = true;
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.postIncrement();
}
void postIncrementDecrementStl()
{
checkpostIncrementDecrement("void f1()\n"
"{\n"
" std::list<int>::iterator it;\n"
" for (it = ab.begin(); it != ab.end(); it++)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\n", errout.str());
checkpostIncrementDecrement("void f1()\n"
"{\n"
" std::list<int>::iterator it;\n"
" for (it = ab.begin(); it != ab.end(); it++)\n"
" ;\n"
" for (it = ab.begin(); it != ab.end(); it++)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\n"
"[test.cpp:6]: (style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\n", errout.str());
checkpostIncrementDecrement("void f2()\n"
"{\n"
" std::list<int>::iterator it;\n"
" for (it = ab.end(); it != ab.begin(); it--)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Decrementing variable 'it' is preferred to Post-Decrementing\n", errout.str());
checkpostIncrementDecrement("void f2()\n"
"{\n"
" std::list<int>::iterator it;\n"
" for (it = ab.end(); it != ab.begin(); it--)\n"
" ;\n"
" for (it = ab.end(); it != ab.begin(); it--)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Decrementing variable 'it' is preferred to Post-Decrementing\n"
"[test.cpp:6]: (style) Pre-Decrementing variable 'it' is preferred to Post-Decrementing\n", errout.str());
checkpostIncrementDecrement("void f1()\n"
"{\n"
" std::list<std::vector<int> >::iterator it;\n"
" for (it = ab.begin(); it != ab.end(); it++)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\n", errout.str());
checkpostIncrementDecrement("void f1()\n"
"{\n"
" std::map<int, std::vector<int> >::iterator it;\n"
" for (it = ab.begin(); it != ab.end(); it++)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pre-Incrementing variable 'it' is preferred to Post-Incrementing\n", errout.str());
}
void postIncrementDecrementClass()
{
checkpostIncrementDecrement("class TestClass;\n"
"void f1()\n"
"{\n"
" TestClass tClass;\n"
" for (tClass = TestClass.begin(); tClass != TestClass.end(); tClass++)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Pre-Incrementing variable 'tClass' is preferred to Post-Incrementing\n", errout.str());
checkpostIncrementDecrement("class TestClass;\n"
"void f1()\n"
"{\n"
" TestClass tClass;\n"
" for (tClass = TestClass.end(); tClass != TestClass.begin(); tClass--)\n"
" ;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Pre-Decrementing variable 'tClass' is preferred to Post-Decrementing\n", errout.str());
}
void dangerousStrolUsage()
{
{

372
test/testpostfixoperator.cpp Normal file
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@ -0,0 +1,372 @@
/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 Daniel Marjamäki and 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 "tokenize.h"
#include "checkpostfixoperator.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestPostfixOperator : public TestFixture
{
public:
TestPostfixOperator() : TestFixture("TestPostfixOperator")
{ }
private:
void check(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
// Assign variable ids
tokenizer.setVarId();
// Fill function list
tokenizer.fillFunctionList();
// Clear the error buffer..
errout.str("");
// Check for postfix operators..
Settings settings;
settings._checkCodingStyle = true;
settings.inconclusive = true;
CheckPostfixOperator checkPostfixOperator(&tokenizer, &settings, this);
checkPostfixOperator.postfixOperator();
}
void run()
{
TEST_CASE(testsimple);
TEST_CASE(testfor);
TEST_CASE(teststream);
TEST_CASE(testvolatile);
TEST_CASE(testiterator);
}
void testsimple()
{
check("\n"
"#include <iostream>\n"
"int main(int argc, char *argv[])\n"
"{\n"
" unsigned int k(0);\n"
" std::cout << k << std::endl;\n"
" k++;\n"
" std::cout << k << std::endl;\n"
" if(k) {\n"
" k++;\n"
" }\n"
" std::cout << k << std::endl;\n"
" k--;\n"
" std::cout << k << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};"
"int main(int argc, char *argv[])\n"
"{\n"
" K k(0);\n"
" std::cout << k << std::endl;\n"
" k++;\n"
" std::cout << k << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};"
"int main(int argc, char *argv[])\n"
"{\n"
" K k(1);\n"
" std::cout << k << std::endl;\n"
" if(k) {\n"
" k++;\n"
" }\n"
" std::cout << k << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};"
"int main(int argc, char *argv[])\n"
"{\n"
" K k(1);\n"
" std::cout << k << std::endl;\n"
" if(k) {\n"
" ++k;\n"
" }\n"
" k++;\n"
" std::cout << k << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};"
"int main(int argc, char *argv[])\n"
"{\n"
" K k(0);\n"
" std::cout << k << std::endl;\n"
" k--;\n"
" std::cout << k << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};"
"int main(int argc, char *argv[])\n"
"{\n"
" K k(0);\n"
" std::cout << k << std::endl;\n"
" ++k;\n"
" std::cout << k << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};"
"int main(int argc, char *argv[])\n"
"{\n"
" K k(0);\n"
" std::cout << k << std::endl;\n"
" --k;\n"
" std::cout << k << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void testfor()
{
check("\n"
"#include <iostream>\n"
"int main(int argc, char *argv[])\n"
"{\n"
" for ( unsigned int i=0; i <= 10; i++) {\n"
" std::cout << i << std::endl;\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};\n"
"int main(int argc, char *argv[])\n"
"{\n"
" for ( K i(0); i <= 10; i++) {\n"
" std::cout << i << std::endl;\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};\n"
"int main(int argc, char *argv[])\n"
"{\n"
" for ( K i(0); i <= 10; ++i) {\n"
" std::cout << i << std::endl;\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};\n"
"int main(int argc, char *argv[])\n"
"{\n"
" for ( K i(10); i > 1; i--) {\n"
" std::cout << i << std::endl;\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};\n"
"int main(int argc, char *argv[])\n"
"{\n"
" for ( K i=10; i > 1; --i) {\n"
" std::cout << i << std::endl;\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void teststream()
{
check("\n"
"#include <iostream>\n"
"int main(int argc, char *argv[])\n"
"{\n"
" int k(0);\n"
" std::cout << k << std::endl;\n"
" std::cout << k++ << std::endl;\n"
" std::cout << k-- << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};\n"
"int main(int argc, char *argv[])\n"
"{\n"
" K k(0);\n"
" std::cout << k << std::endl;\n"
" std::cout << k-- << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"class K {};\n"
"int main(int argc, char *argv[])\n"
"{\n"
" K k(0);\n"
" std::cout << k << std::endl;\n"
" std::cout << ++k << std::endl;\n"
" std::cout << --k << std::endl;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void testvolatile()
{
check("\n"
"#include <iostream>\n"
"class K {};\n"
"int main(int argc, char *argv[])\n"
"{\n"
" volatile K k(0);\n"
" std::cout << k << std::endl;\n"
" k++;\n"
" std::cout << k << std::endl;\n"
" return 0;\n"
"}\n");
TODO_ASSERT_EQUALS("", errout.str());
}
void testiterator()
{
check("\n"
"#include <vector>\n"
"class Base {};\n"
"int main() {\n"
" std::vector<Base*> v;\n"
" v.push_back(new Base());\n"
" v.push_back(new Base());\n"
" for (std::vector<Base*>::iterator i=v.begin(); i!=v.end(); i++) {\n"
" ;;\n"
" }\n"
" v.clear();\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"#include <vector>\n"
"int main() {\n"
" std::vector<int> v;\n"
" std::vector<int>::iterator it;\n"
" for( int i=0; i < 10; ++i ) v.push_back(i);\n"
" unsigned int total = 0;\n"
" it = v.begin();\n"
" while( it != v.end() ) {\n"
" total += *it;\n"
" it++;\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:12]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"#include <vector>\n"
"int main() {\n"
" std::vector<int> v;\n"
" std::vector<int>::const_iterator it;\n"
" for( int i=0; i < 10; ++i ) v.push_back(i);\n"
" unsigned int total = 0;\n"
" it = v.begin();\n"
" while( it != v.end() ) {\n"
" it++;\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:11]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
check("\n"
"#include <iostream>\n"
"#include <vector>\n"
"int main() {\n"
" std::vector<int> v;\n"
" std::vector<int>::iterator it;\n"
" for( int i=0; i < 10; ++i ) v.push_back(i);\n"
" unsigned int total = 0;\n"
" std::vector<int>::reverse_iterator rit;\n"
" rit= v.rend();\n"
" while( rit != v.rbegin() ) {\n"
" rit--;\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:12]: (style) You should use ++ and -- as prefix whenever possible as these are more efficient than postfix operators\n", errout.str());
}
};
REGISTER_TEST(TestPostfixOperator)