Is there any way to tell C++11 to use std::string instead of const char*?

Question

Im trying to migrate code from another language that allows concatonation of strings with the '+' operator.

//defintion void print(std::string s) { std::cout << s; } //call print("Foo " + "Bar");

The issue I'm having is that c++ sees "Foo " and "Bar" as const char* and cannot add them, is there any way to fix this. I have tried including the string library to see if it would change them automatically but that didnt seem to work.

Does this answer your question? How to concatenate two strings in C++? — Michael Hall
– Michael Hall, Commented May 6, 2021 at 4:42
not an answer, but do pass strings between functions as const std::string& s instead of as std::string s. Avoids a copy and enables opitimizations. — selbie
– selbie, Commented May 8, 2021 at 7:44

Remy Lebeau · Accepted Answer · 2021-05-05 23:15:39Z

5

In c++14 and later:

using namespace std::literals; print("Foo "s + "Bar");

In c++11:

std::string operator "" _s(const char* str, std::size_t len) { return std::string(str, len); } print("Foo "_s + "Bar");

Or, in all versions:

print(std::string("Foo ") + "Bar");

edited May 5, 2021 at 23:15

Remy Lebeau

609k36 gold badges516 silver badges875 bronze badges

answered May 5, 2021 at 22:45

Yakk - Adam Nevraumont

280k31 gold badges367 silver badges585 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Remy Lebeau Over a year ago

This is a good solution in general, but as the OP said in comment: "I forgot to mention that I was in c++11", so this won't work for the OP specifically.

rustyx · Accepted Answer · 2021-05-05 22:50:11Z

The easiest solution for the case of 2 string literals:

print("Foo " "Bar");

Otherwise:

print(std::string("Foo ") + "Bar");

Collectives™ on Stack Overflow

Is there any way to tell C++11 to use std::string instead of const char*?

2 Answers 2

1 Comment

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Linked

Related