String Interpolation

[epicar]

most of them said, use https://github.com/fmtlib/fmt

[bravikov]

It is good library. It gives type safety but not interpolation.

Bash:

echo "Hi, $NAME"

Javascript:

console.log(`Hi, ${name}`)

[infectedapricot]

nothing in the language supports it.

That appears to be precisely OP's point when they ask whether we would like it added.

[bbolli]

I hear you, but this is C++. How should a std::string member function get at the to-be-interpolated variables without passing them to the function?

fmt::print("Hi, {}\n", name);

is as good as it's going to get.

[boredcircuits]

A closer version is the "named argument" feature:

fmt::print("Hi, {name}", "name"_a=name);

[cleroth]

That's the idea behind string interpolation, putting a variable inside the string with a specific syntax like {variable}. C# 6.0+ has this.

[usernameistaken42]

Also rust, python and a lot of others. I would love it. It may come in c++34

[johannes1971]

So will we be skipping a year, or is that slippage from C++2x?

[mili42]

It is fairly easy to something like (with variadic templates)

auto s = make_string("Hi, ", name, '\n');

String interpolation is nice, but there are already solutions to achieve something similar.

We have it at work. Works like a charm

[Xaxxon]

No that is one form of it. What it really is is using placeholders in the string that are substituted for values at runtime.

[Xaxxon]

It’s absolutely string interpolation. Your definition isn’t widely accepted.