在命名空间内使用模板

时间:2014-11-09 20:52:13

标签: c++ templates namespaces

我昨天问了这个问题,并认为我已经解决了问题的根源......但是唉,这似乎是另一回事。我不知道问题是什么,但是使用以下代码抛出了这个错误:

错误:

a2main.cpp:36:21: error: no member named 'readJSON' in namespace 'json'
        out = json::readJSON(data_dir + "a2-empty_object.json", e, debug);
              ~~~~~~^

的main.cpp

#include <iostream>
#include <string>
#include "Object.h"

int main(){

std::string out;

        out = json::readJSON(data_dir + "a2-empty_object.json", e, debug);

}

Object.h

#ifndef _JSON_READER_H_
#define _JSON_READER_H_

namespace json{

    enum JSON_TYPE {
        UNKNOWN, EMPTY, ARRAY_OPEN, ARRAY_CLOSE, OBJECT_OPEN, OBJECT_CLOSE, NV_PAIR
    };

    std::string trim(const std::string& str);
    std::string trim(const std::string& str, char c);
    std::string getName(const std::string& str);
    std::string getValue(const std::string& str);
    JSON_TYPE get_json_type(std::string s);

    template<typename T>
    List <T, OBJECTS_PER_JSON_FILE>* deserializeJSON(std::string filename, T obj, bool debug) {

        std::ifstream fin(filename);
        if (fin.fail()){
            throw std::string("Couldn't open: " + filename);
        }


        std::string fline, line, n,v;
        bool done=false;

        auto list = new List <T, OBJECTS_PER_JSON_FILE>();

        return list;
    }


    template<typename T>
    std::string readJSON(std::string jsonFile, T& object, bool debug = false, char delimiter = ',') {
        std::string string_of_values = "test";

        return string_of_values;
    }

}

#endif

为什么抛出函数不在命名空间中的错误?这看起来很奇怪。这可能是模板问题吗?谢谢!

编辑:

In file included from a2main.cpp:13:
./JSONReader.h:60:2: error: unknown type name 'List'
        List <T, OBJECTS_PER_JSON_FILE>* deserializeJSON(std::string filename, T obj, bool debug) {
        ^
./JSONReader.h:60:7: error: expected unqualified-id
        List <T, OBJECTS_PER_JSON_FILE>* deserializeJSON(std::string filename, T obj, bool debug) {
             ^

0 个答案:

没有答案