Re: Unexplained compilation error.

[Robert Heller]

Nevermind.  I needed to use an additional (nested) namespace...

At Fri, 15 Mar 2013 10:41:04 -0500 Robert Heller <heller@deepsoft.com> wrote:

> 
> I have stared at this code fragment and I am not seeing the error.  This
> is from a piece of code that used to compile, but I am migragrating the
> code from the depreciated hash_map to an unordered_map.  There is
> *obviously* something wrong here, but I am just not seeing it.
> 
> ================Begin test.cc===========================
> #include <string.h>
> #include <iostream>
> 
> 
> #ifdef __GNUC__
> #  if __GNUC__ > 3
>        // GCC > 3
> #    include <tr1/unordered_map>
> #    define USE_UNORDERED_MAP
> #  else
>       // GCC < 4
> #    define USE_HASH_MAP
> #    include <ext/hash_map>
> #  endif
> #else      // ...  there are other compilers, right?
> #  define USE_HASH_MAP
> #endif
> 
> #ifdef USE_HASH_MAP
> /** @brief Equality structure.
>   *
>   * Used with the hash map used for Print Options 
>   *
>   * @author Robert Heller \<heller\@deepsoft.com\>
>   *
>   */
> struct eqstr
> {
>       bool operator()(const char* s1, const char* s2) const
>       {
>               return strcmp(s1, s2) == 0;
>       }
> };
> #endif
> /** @brief Option hash map, used for Print options.
>   *
>   * @author Robert Heller \<heller\@deepsoft.com\>
>   *
>   */
> 
> #ifdef USE_HASH_MAP
> typedef __gnu_cxx::hash_map<const char*, string, __gnu_cxx::hash<const 
> char*>, eqstr> OptionHashMap;
> #else
> typedef std::unordered_map<const char*, string> OptionHashMap;
> #endif
> 
> int main(int argc, char *argv[]) {
>       OptionHashMap theMap;
> 
>       std::cout << "GCC Major Version is " << __GNUC__ << std::endl;
>       if (__GNUC__ > 3) {
>               std::cout << "GCC Major Version is greater than 3" << std::endl;
>       } else {
>               std::cout << "GCC Major Version is less than or equal to 3" << 
> std::endl;
>       }
>               
> #ifdef USE_UNORDERED_MAP
>       std::cout << "Using unordered_map" << std::endl;
> #endif
> #ifdef USE_HASH_MAP
>       std::cout << "Using hash_map" << std::endl;
> #endif
> 
> }
> ====================End test.cc==============
> 
> sauron.deepsoft.com% g++ -Wall test.cc -o test
> test.cc:44: error: expected initializer before ‘<’ token
> test.cc: In function ‘int main(int, char**)’:
> test.cc:48: error: ‘OptionHashMap’ was not declared in this scope
> test.cc:48: error: expected `;' before ‘theMap’
> sauron.deepsoft.com% g++ -v
> Using built-in specs.
> Target: x86_64-redhat-linux
> Configured with: ../configure --prefix=/usr --mandir=/usr/share/man
> --infodir=/usr/share/info --enable-shared --enable-threads=posix
> --enable-checking=release --with-system-zlib --enable-__cxa_atexit
> --disable-libunwind-exceptions --enable-libgcj-multifile
> --enable-languages=c,c++,objc,obj-c++,java,fortran,ada
> --enable-java-awt=gtk --disable-dssi --disable-plugin
> --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre
> --with-cpu=generic --host=x86_64-redhat-linux
> Thread model: posix
> gcc version 4.1.2 20080704 (Red Hat 4.1.2-54)
> 
> 

-- 
Robert Heller             -- 978-544-6933 / heller@deepsoft.com
Deepwoods Software        -- http://www.deepsoft.com/
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