Debugger.cpp

#include <bits/stdc++.h>
using namespace std;
namespace debugger {
#ifdef DEBUG
template <typename T> void __print_var(string_view name, const T &x) {
    std::cerr << name << " = " << x;
}
void __print_var(string_view name, const string &x) {
    std::cerr << name << " = \"" << x << "\"";
}
void __print_var(string_view name, const char &x) {
    std::cerr << name << " = \'" << x << "\'";
}
template <typename T> void __print_var(string_view name, const vector<T> &x) {
    std::cerr << name << " = ";
    bool is_first = true;
    for (auto &ele : x)
        std::cerr << (is_first ? (is_first = false, "[") : ", ") << ele;
    std::cerr << "]";
}
template <typename T> void __print_var(string_view name, const set<T> &x) {
    std::cerr << name << " = ";
    bool is_first = true;
    for (auto &ele : x)
        std::cerr << (is_first ? (is_first = false, "{") : ", ") << ele;
    std::cerr << "}";
}
template <typename K, typename V>
void __print_var(string_view name, const map<K, V> &x) {
    std::cerr << name << " = ";
    bool is_first = true;
    for (auto &[k, v] : x)
        std::cerr << (is_first ? (is_first = false, "{") : ", ") << "(" << k
                  << ": " << v << ")";
    std::cerr << "}";
}
template <typename T> void __log(string_view name, const T &x) {
    __print_var(name, x);
    std::cerr << '\n';
}
template <typename T, typename... Ts>
void __log(string_view name, const T &x, const Ts &...others) {
    size_t pos = name.find(',');
    __print_var(name.substr(0, pos), x);
    std::cerr << ", ";
    __log(name.substr(pos + 1), others...);
}

#define LOG(args...)                                                           \
    {                                                                          \
        std::cerr << "line " << __LINE__ << ": " << __func__ << "(): ";        \
        __log(#args, ##args);                                                  \
    }
#else
#define LOG(...)
#endif
} // namespace debugger
using namespace debugger;
auto main() -> int {
    string s;
    s = "helloworld";
    LOG(s);
}