相关疑难解决方法(0)

我想阻止人们在不处理返回值的情况下调用lambda.

Clang 4.0拒绝我尝试过的所有内容,使用-std = c ++ 1z进行编译:

auto x = [&] [[nodiscard]] () { return 1; };
// error: nodiscard attribute cannot be applied to types

auto x = [[nodiscard]] [&]() { return 1; };
// error: expected variable name or 'this' in lambda capture list

auto x [[nodiscard]] = [&]() { return 1; };
// warning: nodiscard attribute only applies to functions, methods, enums, and classes

[[nodiscard]] auto x = [&]() { return 1; };
// warning: nodiscard attribute …