CString is quit handy, while std::string is more compatible with stl container. I am using hash_map, however, hash_map does not support CString as key, so I wish I could convert CString into std::string, is it possible? Write a CString hash function seems take lots of time. CString ------> std::string ? how can I do? std::string -----...
I'm using std::string and need to left pad them to a given width. What is the recommended way to do this in C++? Sample input: 123 pad to 10 characters. Sample output: 123 (7 spaces, prior to 123) ...
int main(void) { std::string foo("foo"); } My understanding is that the above code uses the default allocator to call new. So even though the std::string foo is allocated on the stack the internal buffer inside of foo is allocated on the heap. How can I create a string that is allocated entirely on the stack? ...
When I use std::string and when char* to manage arrays of chars in C++? It seems you should use char* if performance(speed) is crucial and you're willing to accept some of a risky business because of the memory management. Are there other scenarios to consider? ...
I have following code: Tools::Logger.Log(string(GetLastError()), Error); GetLastError() returns a DWORD a numeric value, but the constructor of std::string doesnt accept a DWORD. What can I do? thanks in advance ...
How to force std::stringstream operator >> to read an entire string instead of stopping at the first whitespace? I've got a template class that stores a value read from a text file: template <typename T> class ValueContainer { protected: T m_value; public: /* ... */ virtual void fromString(std::string & str) { std::strings...
I need to use std::string to store data retrieved by fgets(). To do this I need to convert fgets() char* output into an std::string to store in an array. How can this be done? ...
I have the following string: index 0 1 2 3 4 5 6 7 std::string myString with the content of "\xff\xff\xff\x00\xff\x0d\x0a\xf5" When I'm refering to myString[3], I get the expected '\x00' value. But when I'm referring to myString[5], I get two values "\x0d\x0a" instead of just '\x0d'...
The situation: I have a std::vector that contains strings at specific offsets. Here's a shortened dump: ... @128 00 00 00 00 00 00 00 00 73 6F 6D 65 74 68 69 33 ........somethin @144 38 36 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ng.............. @160 00 00 00 00 00 00 00 00 31 2E 32 2E 33 00 00 00 ........1.2.3... @176 00...
As a learning exercise, I have been looking at how automatic type conversion works in C++. I know that automatic type conversion should generally be avoided, but I'd like to increase my knowledge of C++ by understanding how it works anyway. I have created a StdStringConverter class that can be automatically converted to a std::string, ...
I have an std::string containing a command to be executed with execv, what is the best "C++" way to convert it to the "char *argv[]" that is required by the second parameter of execv()? To clarify: std::string cmd = "mycommand arg1 arg2"; char *cmd_argv[]; StrToArgv(cmd, cmd_argv); // how do I write this function? execv(cmd_argv[0], ...
Why would I ever want to call std::string::data() over std::string::c_str()? Surely there is some method to the standard's madness here... ...
Dear All, I have the following problem. I am trying to integrate a large code written by me with a QT interface. Some of my functions return std::string; I did not succeed in making setText accept them (other functions returning char do not give me problems). What should I do? Thanks! Giuseppe ...
I'm trying to compile the following code in C++ string initialDecision () { char decisionReviewUpdate; cout << "Welcome. Type R to review, then press enter." << endl; cin >> decisionReviewUpdate; // Processing code } int main() { string initialDecision; initialDecision=initialDecision(); //ERROR OCCURS HERE // Mor...
Recently I've noticed that the following statement is not true given std::string s. s.max_size() == s.get_allocator().max_size(); I find this interesting, by default std::string will use std::allocator<char> which has a theoretical limit of size_type(-1) (yes i know I'm assuming 2's complement, but that's unrelated to the actual quest...
Is there anyway to read a known number of bytes, directly into an std::string, without creating a temporary buffer to do so? eg currently I can do it by boost::uint16_t len; is.read((char*)&len, 2); char *tmpStr = new char[len]; is.read(tmpStr, len); std::string str(tmpStr, len); delete[] tmpStr; ...
Is there an string equivalent to LPTSTR? I know of string and wstring. Is there a tstring? ...
class mystring { private: string s; public: mystring(string ss) { cout << "mystring : mystring() : " + s <<endl; s = ss; } /*! mystring& operator=(const string ss) { cout << "mystring : mystring& operator=(string) : " + s <<endl; s = ss; //! return this; return (mystring&)this; // why COMPILE ERROR } */ mystring o...
I'm doing some maintenance work and ran across something like the following: std::string s; s.resize( strLength ); // strLength is a size_t with the length of a C string in it. memcpy( &s[0], str, strLength ); I know using &s[0] would be safe if it was a std::vector, but is this a safe use of std::string? ...
I have a class which returns a typed pointer to a "const TCHAR". I need to convert it to a std::string but I have not found a way to make this happen. Can anyone provide some insight on how to convert it? ...