没有匹配的成员函数调用 child.value
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【中文标题】没有匹配的成员函数调用 child.value【英文标题】:No matching member function for call to child.value 【发布时间】:2015-06-26 10:22:07 【问题描述】:当我尝试编译下面的代码时出现错误:
src/main.cpp:51:48: error: no matching member function for call to 'child_value'
std::cout << "which has value" << eb.second.child_value(kv.second);
~~~~~~~~~~^~~~~~~~~~~
我不明白的是我能够在上面的循环中使用它。我只能假设它希望我改用kv.second.child_value(kv.second);
。但是我希望它在 for (auto& eb: mapb)
返回的 xml 上运行此代码。
#include "pugi/pugixml.hpp"
#include <iostream>
#include <string>
#include <map>
int main()
const std::map<std::string, std::string> tagMap
"description", "content", "url", "web_address"
;
pugi::xml_document doca, docb;
std::map<std::string, pugi::xml_node> mapa, mapb;
if (!doca.load_file("a.xml") || !docb.load_file("b.xml"))
std::cout << "Can't find input files";
return 1;
for (auto& node: doca.child("data").children("entry"))
const char* id = node.child_value("id");
mapa[id] = node;
for (auto& node: docb.child("data").children("entry"))
const char* idcs = node.child_value("id");
if (!mapa.erase(idcs))
mapb[idcs] = node;
// For removed
for (auto& ea: mapa)
std::cout << "Removed:" << std::endl;
ea.second.print(std::cout);
// For added nodes
for (auto& eb: mapb)
// Loop through tag map
for (auto& kv : tagMap)
// Try to find the tag name named in second map value
// and associate it to the type of information in first map value
std::cout << "Found" << kv.first;
std::cout << "which has value" << eb.second.child_value(kv.second);
如果有人能解释我做错了什么,我将不胜感激。
【问题讨论】:
试试child_value(kv.second.c_str())
。
【参考方案1】:
根据here发现的两个重载
// Get child value of current node; that is, value of the first child node of type PCDATA/CDATA
const char_t* child_value() const;
// Get child value of child with specified name. Equivalent to child(name).child_value().
const char_t* child_value(const char_t* name) const;
你需要传递一个指向字符串(或字符串字面量)的指针。
std::cout << "which has value" << eb.second.child_value(kv.second.c_str());
^^^^^^^^^^^^^^^^^
【讨论】:
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