KEIL错误：没有重载函数“ std :: transform”的实例与参数列表匹配

Question

I have a problem that does no resurface (even no warnings) in XCode but does allow me to compile in Keil MDK.

void grammar::parse(std::string &_expr) {
    std::transform(_expr.begin(), _expr.end(), _expr.begin(), std::tolower);
    _expr.erase(std::remove_if(_expr.begin(), _expr.end(), std::isspace), _expr.end());
}

That is what I get

error: #304: no instance of overloaded function "std::transform" matches the argument list error: #304: no instance of function template "std::remove_if" matches the argument list

Header included:

#include <iostream>
#include <sstream>
#include <iomanip>
#include <cmath>
#include <stdlib.h>
#include <math.h>
#include <ctype.h>
#include <stdio.h>
#include <algorithm>

Could you please advise me on where to look? I am surprised that XCode version works as expected...

Answer 1

You include ctype.h , that header declares a function tolower in the global namespace (this is part of the C library, so there are no other namespaces there). Maybe you meant to include cctype . For a given C standard library header Xh , there is a c++ version cX that provides some of the same functionality inside the ::std namespace.