由于某些原因,在mingw上尝试使用G++编译以下代码时:
我得到了以下错误。
#include <iostream>
#include <string>
#include <cctype>
int main( int argc, char **argv )
{
std::string s( "Hello, World!" );
decltype( s.size( ) ) punct_cnt = 0;
for ( auto c : s )
{
if ( ispunct( c ) )
++punct_cnt;
}
std::cout << punct_cnt << " punctuation characters in " << s << std::endl;
return 0;
}
我得到了以下错误。
test.cpp: In function 'int main(int, char**)':
test.cpp:9:23: error: 'decltype' was not declared in this scope
test.cpp:9:25: error: expected ';' before 'punct_cnt'
test.cpp:11:13: error: 'c' does not name a type
test.cpp:17:2: error: expected ';' before 'std'
test.cpp:17:15: error: 'punct_cnt' was not declared in this scope
test.cpp:19:2: error: expected primary-expression before 'return'
test.cpp:19:2: error: expected ')' before 'return'
我已经检查过,g++编译器的版本是4.7.2,除了将decltype
更改为std::string::size_type
,还有其他解决方法吗?请注意不要删除HTML标签。