我有一个具有以下重载的类:
template<typename T>
ParamContainer &operator<<(keyValue<T> &couple)
{
insert(couple.key_, couple.value_);
return *(this);
}
和键值
template <typename T>
struct keyValue
{
std::string key_;
T value_;
keyValue(std::string key, T &value): key_(key), value_(value){}
};
我想这样称呼我的运营商<<:
ParamContainer p;
p << ("value", "content") << ("id", 5);
所以我试图定义这个东西:
#define ParamContainer<<(X, Y) ParamContainer<<keyValue(X, Y)
或者
#define ParamContainer::operator<<(X, Y) ParamContainer<<keyValue(X, Y)
但它没有编译:
src/TemplateEngine.hpp:48:25: warning: ISO C99 requires whitespace after the macro name [enabled by default] src/ControllerPost.cpp: In member function 'virtual void ControllerPost::operator()(boost::cmatch&, http::server3::reply&, boost::container::flat_map<std::basic_string<char>, std::shared_ptr<PostParam> >&)':
src/ControllerPost.cpp:32:19: error: expected unqualified-id before '<<' token
src/ControllerPost.cpp:32:19: error: 'X' was not declared in this scope
src/ControllerPost.cpp:32:19: note: suggested alternative:
/usr/local/include/boost/function/function_base.hpp:92:13: note: 'boost::detail::function::X'
src/ControllerPost.cpp:32:19: error: 'Y' was not declared in this scope
src/ControllerPost.cpp:32:19: error: expected ';' before 'ParamContainer'
src/ControllerPost.cpp:34:3: error: 'm' was not declared in this scope
从第 32 行开始:
TemplateEngine::ParamContainer m;
m << ("name", "value");
如果我不能使用 C++ 符号,我想我会找到另一种方法