All Questions
19 questions
0
votes
1
answer
304
views
When should I delete the std::string returned from std::smatch inside a regex iterator, if at all?
I'm new to C++, and I have been playing around with its standard regex library. I made this proof of concept search function based on the following reference.
https://en.cppreference.com/w/cpp/regex/...
- 508
1
vote
0
answers
288
views
rvalue and lvalue of std::string
i ran the code as shown and i am confused as to why a+b is a rvalue. From what i know, rvalue should only have a data or address and in such a case std::string should be a lvalue isn't it?
void foo(...
- 182
0
votes
1
answer
184
views
Why is std::string range constructor giving me an error macro passed 2 arguments, but takes just 1? [closed]
I have these two iterators that are used by the Boost parser:
std::string equationToParse = "some_text";
std::string::const_iterator iter = equationToParse.begin();
std::string::...
- 151
1
vote
1
answer
252
views
Why can't compilers optimize-out this std::string construction?
Consider the following code:
#include <string>
#include <cstring>
size_t foo(const char* cptr)
{
if (cptr == nullptr) { return 0; }
return strlen(cptr);
}
size_t bar()
{
...
- 130k
3
votes
2
answers
103
views
Ambigous integer assignment to string c++
So, while playing around with C++, I did this:
#include <iostream>
int main() {
std::string s{"someThing"};
std::cout << " s is: " << s << '\n';
s = 97;
std::...
- 939
0
votes
0
answers
226
views
C++ printf no longer works after declaring an std::string
I'm trying to set up a new dev environment (Cygwin64 on Windows 7) and the following test code is not working:
#include <stdio.h>
#include <string>
int main(int argc, char *argv[])
{
...
- 477
2
votes
0
answers
402
views
C++ program with string class fails before main() breakpoint is hit, remove the string variable and it works as expected
My environment is
Windows 10
Cygwin64
g++ 5.2.0
The following program works as expected (main executes without error, returns 0)
#include <iostream>
#include <string>
using namespace ...
1
vote
0
answers
214
views
Segmentation fault on global std::string variables with g++ 3.4 and g++ 4.7
I have the following code:
main.cpp
#include <string>
#include <iostream>
using namespace std;
string getString();
int main()
{
cout<<getString()<<endl;
return 0;
}
mylib....
- 81
3
votes
1
answer
979
views
std::string initialization with a bool
Consider the following initialization:
std::string falseString = false;
std::string trueString = true;
With g++ 5.2.0, compiler throws a warning for falseString, while an error for trueString.
With ...
- 9,609
1
vote
2
answers
2k
views
The procedure entry point could not be located [duplicate]
I'm trying to compile a C++ program with MinGW on Windows 10, but I keep receiving the following error (-Wall and -Werror are activated):
The procedure entry point
...
- 2,104
-3
votes
3
answers
728
views
memcpy on new std::string implementation (gcc 5.1)
I have written the following code which seems to be working fine with old std::string implentation. But with gcc 5.1, it crashes.
#include <string>
#include <iostream>
#include <...
- 132
0
votes
2
answers
124
views
c++ compiler error using g++ -c: compiler recognizes a const string& as int
i created a class Products that has the constructor
Product::Product(const int &num,const float &pr,const std::string &str):
number(num),price(pr),name(str)
{
}
i have the declaration in ...
1
vote
0
answers
276
views
Why g++/clang do not support std::basic_string<T>::replace with const_iterators?
As I've found in the latest standard draft and on cppreference.com std::basic_string<T>::replace could be called with const_iterators as its arguments (for example in its second form where part ...
- 5,236
1
vote
1
answer
903
views
Different behavior of boost::serialization of strings on text archive
I'm having some issue serializing a std::string with boost::serialization on a text_oarchive. AFAICT, I have two identical pieces of code that behaves differently in two different programs.
This is ...
- 2,699
1
vote
1
answer
997
views
c++ compare std::string won't work if I don't compile with Code::Blocks but cygwin
I'm coding a class that should read OFF Files and I'm having the following issue:
If I compile it within the Code::Blocks environment everything works fine.
If the first line of the file that is to ...
- 57
1
vote
1
answer
2k
views
Why does not std:string + int give compilation error?
We just found our colleague thought he can add an integer to std::string and used such operation here and there in his code.
We don't see any compiler error for this operation and I don't understand ...
- 17.7k
4
votes
2
answers
3k
views
Reference-counting of std::string
I'm looking at the code for basic_string (that is bundled with g++ 4.2.1). The copy constructor makes use of a grab() function to "grab" a copy of a string (increment its reference-count):
_CharT* ...
- 7,081
12
votes
3
answers
7k
views
Avoiding improper std::string initialization with NULL const char* using g++
A there any g++ options which can detect improper initialization of std::string with NULL const char*?
I was in the process of turning some int fields into std::string ones, i.e:
struct Foo
{
...
- 3,063
3
votes
2
answers
3k
views
Invalid free while performing a std::string assign with -O2 set in g++
Before I get blasted on opening another question, this question is related to another question that I opened a few days ago:
C++ Program Always Crashes While doing a std::string assign
After ...
- 2,039